Discussion of Question with ID = 020 under Decimal-Numbers

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Question

What is ${(-82) × 7.2 - 32 × (-3.4)}/2.5$?

A

$-192{16/25}$.

B

$-192{12/25}$.

C

$+192{16/25}$.

D

$+192{12/25}$.

Soln.
Ans: a

Observe that all fractional numbers are having one digit to the right of the dot. So we can cancel all the dots and get a plain expression: ${(-82) × 72 - 32 × (-34)}/25$. We can now simpilfy the minus signs to get ${(32 × 34) - (82 × 72)}/25$ which equals ${-4816/25}$, which is same as: $-192{16/25}$

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