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This could be done by changing the decimals into fractions (-15/10)(12/10)=-18/10 (45/10)(4/10)=18/10 (-18/10)-(18/10)=-36/10 (-36/10)/30= -0.12 hence B
As always, scan the answers BEFORE solving the question. Here, the answer choices are VERY SPREAD APART, so we can be very aggressive with our estimation. [(-1.5)(1.2) - (4.5)(0.4)]/30 ≈ [(-2)(1) - (4)(0.5)]/30 ≈ [-2 - 2]/30 ≈ [-4]/30
The key to this problem is remembering Principles of Arithmetic and order of operations. Parenthesis are first. Resolve everything in the numerator before dividing by the denominator. Also, remember that subtracting a positive from a negative number is the same as subtracting in that (-) - (+) = (-) or moving left on the number line.
Answer is (B) -0.12
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gmatclubot
Re: ((-1.5)(1.2)-(4.5)(0.4))/30
[#permalink]
22 Aug 2017, 13:05