Answer: Option B
:
B
Let the required number of toys produced by 7 machines in 5 minutes be n.
As the time increases, the number of toys increases. Hence they are in direct proportion.

n = 490 x 5= 2450
So, 7 machines can make 2,450 toys in 5 minutes.
As the number of machines increases, number of toys increases. They are in direct proportion.
Let k is thenumber of toys produced by 10 machines in 5 minutes.

Then, k = $\frac{2450\times 10}{7}$
$⟹$ k = 3500
So, the number of toys produced = 3,500