CAT 1997 Question Paper Question 45

Question 45

A student instead of finding the value of 7/8 of a number, found the value of 7/18 of the number. If his answer differed from the actual one by 770, find the number.


let's say number is x.

So $$\frac{7x}{8} - \frac{7x}{18} = 770$$

or $$x = 1584$$

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