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# GMAT: Math 21

110-114, pgs. 166-167. Created by Sal Khan.

## Want to join the conversation?

• hey I got this test question finding it hard
a shop has a special offer
reduction of 10% when your bill is between £50 and£100
reduction of 20% when your bill is more than £100
before the reductions, mary bill is £96 and Richard bill is£ 108
after reduction who paid more
it is quite ok q
but not sure bout it • In problem # 114, the question is "Which of the following is the product of two integers whose sum is 11?" I don't understand why the answer is -42 and not any other sum of integers that equal 11. For example, I could just as easily say that 18 is the answer (2 x 9), or 24 is the answer (3 x 8) or 30 is the answer (6 x 5). Why -14 and 3? • If the sum of the two numbers equal 11, the two numbers have to be odd and even. Your response is correct, but the answer choices in the book are A. -42, B. -28 C. 12 D.26. E. 32. Since you seem like you know the multiplication table, you can mentally see which choices would work. For example -13+-2 = -26, will give you an idea on where to start.
You can then rule out -28 because -7+4, -14+2, and 28+1 don't equal 11. This leaves you with choice A and you can double check your answer by factoring -42 out -6*7= 2*-3*7=14*-3=-42.  