Your answer is 157, i'm pretty sure
48 cm. You have 16 units and know that 2 of them equal 6 cm. So you can either divide 16 by 2 and multiply by 6 or notice that each square is worth 3 cm and multiply 16 by 3 to get 48.
Three hundred and ten million, seven hundred sixty-three thousand, one hundred and thirty-six
8 * 18 = 144
200 - 144 = 56
so $56 dollars would be left in your bank account