A SLICE OF CHOCOLATE CAKE COSTS 28 BATH, A SLICE OF VANILLA CAKE COSTS 21 BAHT AND A SLICE OF STRAWBERRY CAKE COSTS 35 BATH. WHAT IS THE LEAST NUMBER OF SLICES OF EACH CAKE THAT MUST BE PURCHASED SO THAT THE AMOUNT OF MONEY PAID FOR EACH TYPE OF CAKE IS THE SAME?
How much money is paid for each type of cake?