Question

Question 6

Only one of the four options is correct. Write the correct one.

In a box, the ratio of red marbles to blue marbles is 7 : 4. Which of the following could be the total number of marbles in the box?

a) 8

b) 19

c) 21

d) 22

Answer 1

Given, the ratio of red marbles to blue marbles = 7 : 4
Let the number of red marbles = 7x
and blue marbles = 4x
Then, total number of marbles = 7x + 4x
= 11x
Total number of marbles must be multiple of 11
By observation,
$\therefore 11x=22$
$\Rightarrow x=2$
Hence, (d) is the correct option.