1.Onthefarm,therearetwelveducksandeightpigs.look!Therearefourducksswimminginthepond
howmanyanimalsonthefarm?whatoperationdoyouuse
2.inthesupermarket,thereare28basketbals,ibuytwo,andJerrybuys4basketalls.Howmanybasketballsleftinthesupermarket?Whatoperationdoyouuse?
WriteaprobleminEnglishandsolveit.