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Which one of the following is the other number if the product of two numbers is $− 8$ and one of the number is $− 12$ ?

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13

23

43

53

answer is B.

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Detailed Solution

Given:
The product of two numbers is -8.
And one of the numbers is -12.
Let the other number be x.
According to the given condition,

(− 12) × x = − 8

Multiplying

− 1 12

on both sides,

x × (− 12) × − 1 12 = − 8 × − 1 12

− 1 12

is multiplicative inverse of

− 12

. So their product will be 1.

x × 1 = (− 8) × (− 1) 12 x = 812

x = 23

Therefore, the other number is

23

.
Hence, option (2) is correct.

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