Question

How many numbers between 400 and 700 are multiples of 9
and 11?

Answer 1

I think only 3 these r multipl of both 11 and 9

Answer 2

LCM = 99

400/99 = 4 gets quotient  and reminder also there

so 99 x 5 = 495 is first number

700 /99 = 7 as quotient and reminder also there

99 x 7 = 693 is the largest number

(693/99) = 7

(495/99) = 5

(7 - 5) + 1 = 3