Question

In a hall there are 200 chairs. The chair number of Prathmesh is divisible by 9 and 7. What would be the chair number of Prathmesh ?

Answer 1

as it is divisible by 9 and 7 both so it must include their multiples.
so his chair no. could be 63,126 or 189

Answer 2

Solution :-

Total number of chairs = 200

Chair number on which Prathamesh is sitting, is divisible by 7 and 9 both.

So, we have to find the LCM of 7 and 9

LCM of 7 and 9

7 = 1 × 7

9 = 3 × 3

LCM = 3 × 3 × 7

= 63

So, LCM of 7 and 9 is 63

Now, the chair number of Prathamesh on which he is sitting is the multiple of 63.

Multiple of 63 from 1 and 200 (Both inclusive) are as follows.

63, 126 and 189

So, chair number of Prathamesh on which he is sitting is 63 or 126 or 189