Question
A student instead of finding the value of 78 of the number, found the value of 718 of the number. If his answer differed from the actual one by 770, find the number. (CAT 1997)
Answer: Option A
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A
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A
Ans: (a)
7Dx−71Dx=770=(126−56144)x=770=x=1584
Elimination strategy:
As 718 is slightly less than half of 78,we have to find the answer which is slightly greater than twice of 770, hence check the given conditions for 1584 and 1656, the other options can be easily eliminated. Check manually for 1584. we find that the difference is 770, hence that is the option.
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