When adding 51.2 to a certain number, the sum is 56.05, as seen below. What number should go in the box to complete the addition problem?

what is a pre-existing condition claus?

means if you're already damaged some way when you take out a medical insurance you will not get full compensation for that injury that you already have.

cross multiplying, we get :

⇒ (3) × (5) = (9) × (x)

⇒ 15 = 9x