PItODUCING THE SAME [Technical Field of the Invention] [OOOl] The present invention relates to a high-strength low-specific-gravity galvanized steel sheet having superior galvanizing property and hole expandability ~wrhich is used for an automobile component or the like, and method for producing the same. Priority is claimed on Japanese Patent Application No. 2013-96427, filed on May 1,2013, the content of which is incorporated herein by reference. [Related Art] [0002] Recently, as a countermeasure against environmental problems, reduction in the weight of a vehicle has bee11 desired in order to reduce carbon dioxide emissions and fuel consumption. In order to reduce the weight of a vehicle, high-strengthening of steel is an effective means. However, when the lowver limit of the thickness of a steel sheet is limited due to rigidity required for a component, the thickness of the steel sheet cannot be reduced even after high-strengthening of steel, and it is difficult to reduce the weight of a vehicle. [0003] Therefore, for example, as disclosed in Patent Docunlents 1 to 5, some of the present inventors proposed a high Al-content steel sheet in which the specific gravity is reduced by adding a large amount of A1 to steel. In the high Al-content steel sheets disclosed in Patent Documents 1 to 5, problems of a high Al-content steel sheet of the related art including poor producibility sucl~as cracking, ~vhichm ay occur during rolling, and low ductility are solved. Further, in order to improve the ductility, the hot workability, and the cold workability of a high Al-content steel sheet, for example, as disclosed in Patent Document 6, the present inventors proposed a method of adjusting a solidification structure after casting to be a fitle equiaxed structure. Further, for example, as disclosed in Patent Document 7, the present inventors proposed a method of improving the toughness of a high Al-content steel sleet by optimizing the colnponellts thereof. [Prior A1-t Document] [Patent Document] [0004] [Patent Document I] Japanese Ut~examinedP atet~At pplication, First Publication No. 2005-15909 [Patent Document 21 Japanese Unexamined Patent Application, First Publication No. 2005-29889 [Patent Document 31 Japanese Unexamined Patent Application, First Publication No. 2005-273004 [Patent Document 41 Japanese Unexamined Patent Application, First Publication No. 2006-176843 [Patent Document 51 Japanese Unexamit~edP atent Application, First Publication No. 2006-1 76844 [Patent Docu~nen6t 1 Japanese Unexamined Patent Application, First Publication No. 2008-261023 [Patent Document 71 Japanese Unexamined Patent Application, First Publication No. 2010-270377 [Disclosure of the Inventio~i] [Problems to be Solved by the Invention] [OOOS] Recently, a high Al-content steel sheet having superior ductility, workability, and toughness has been able to be produced on an industrial scale. However, there is a problem that the high Al-content steel sheet has poor galvanizing property. In addition, the hole expandability of the higli Al-content steel sheet is lower than that of a general automobile steel sheet having the same strength, and thns tlie use of the high Al-content steel sheet is limited. Accordingly, the itnprovetnents of the galvanizing property and the hole expandability are important issues for increasing the application range of the high Al-content steel sheet to automobile components. The higli Alcontent steel sheet has, for example, superior arc weldabilitj~. However, the spot weldability of the high Al-content steel sheet is lower than that of a general autonlobile steel sheet having the same strength, and thus the use of the high Al-content steel sheet is limited. Here, a poor galvanizing propem means that a non-plating zone is generated on the steel sheet, that plating adhesion is reduced, or that both phetiometions occurred. [0006] The present invention has been made in consideration of the above-described actual circun~stancesa, nd an object thereof is to provide a high-strength lo\\'-specificgravity galvanized steel sheet having superior galvanizitig property and hole expandability which is obtained by i~nprovitigtl ie galvanizing property and the hole expandability of a high Al-content steel sheet having low-specific-gravity to which A1 is added, and to provide a nietliod for producing the sanle. [Means for Solving the Problen~] [0007] The present inventors investigated hot-dip galvanizing conditions in order to inlprove the galvanizing property and the hole expandability of a high Al-content steel sheet based on the chemical cotnponents of the Iiigh-strength low-specific-gravity high Al-content steel sheet having superior ductility, workability and toughness, which is suggested by the presetit inventors in Patent Document 7. As a result, the present it~\~eiltofrosu nd that the galvanizing property and the hole expaudability of the high Al-content steel sheet cat1 be improved by being subjected to hot-dip galva~~izinugn der tlle appropriate conditions, after a treatment such as a~lllealingm, echanical descaling or pickling is subjected to a hot-rolled steel sheet or a cold-rolled steel sheet as necessary, and Ni-preplating is subjected to the hot-rolled steel sheet or the cold-rolled steel sheet. Furthermore, after the hot-dip galvanizing is performed, the high Al-content steel plate can be i~nprovedin terms of formability, coating corrosiot~re sistance, weldability and the like by being subjected to an alloying heat treatiiletlt under the appropriate conditions. Hereinafter; a high Al-content steel sheet may be referred to as a steel sheet. [OOOS] In addition, in order to improve the spot \veldability of the galvanized steel sheet that is the higlt Al-contet~ts teel sheet performed by a hot-dip galvanizing treatnlent and an alloying treatment as necessary, the present inventors investigated elenlents xvliich decrease spot weldability. As a result, the present inventors found the follo\ving facts: the spot weldability of a galvanized steel sheet is greatly affected by the Mn content thereof; and the spot weldability thereof call be significantly improved by reducing the Mn content thereof. The sununary of the present invention is as follo\vs. [0009] (1) According to an aspect of the present invention, a galvanized steel sheet inclitdes: a steel slicet; and a galvanizing layer which is formed on a surface of the steel sheet; in which the steel sheet includes as a chemical conlponent, by mass%, C: more than 0.100% to 0.500%, Si: 0.0001% to less than 0.20%, Mn: more than 0.20% to 3.00%, Al: 3.0% to 10.0%, N: 0.0030% to 0.0100%, Ti: more than 0.100% to 1.000%, P: 0.00001% to 0.0200%, S: 0.00001% to 0.0100% and a remainder including Fe and impurities; in ~vhichth e sun1 of the C content and the Ti content satisfies 0.200