If three numbers are in the ratio 2 : 3 : 5 and the twice of their sum is 200. The square of the largest of three numbers is:

2500 1000 625 2250

2500

Here, A : B : C = 2 : 3 : 5 ⇒ 2(2 + 3 + 5) units = 200 ⇒ (2 x 10)units = 200 ⇒ 20 units = 200 ⇒ 1 unit = 10, ⇒The square of the largest of three numbers = 5 x 10 = 50 x 50 = 2500.