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Q.

By what number should we multiply -1528 so that the product may be  -57 ?


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a

 43 

b

 -158

c

 57

d

-43 

answer is A.

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Detailed Solution

Given,
Product of the numbers =-57.
One of the given number = -1528. Let x be the other number.
⇒xy= −5 7 ⇒x −15 28 = −5 7 ⇒x= −5 7 −15 28 ⇒x= −5 7 × 28 −15      ∵ a b ÷ c d = a b × d c ⇒x= 4 3   Therefore the required other number is 43 .
Correct option is 1.
 
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