Question

when an unknown number is multiplied by 7, the product so obtained lies in between 40 and 50 if this unknown number is a composite number, then the third multiple of this number is -----

Answer 1

Answer:

The third multiple of the required number is 18

Step-by-step explanation:

Let "x" be the unknown number.

ATQ, 7x lies between 40 and 50

The two multiples of 7 that lie between 40 and 50 are 42 (sixth multiple) and 49 (seventh multiple).

This means that x = 6 or x = 7

Now, x is a composite number, we eliminate the possibility of x = 7

Hence, x = 6.

And, the third multiple of x is 3*6 = 18.