Algebra Question!

Question

Carbon (C) is what percent by weight of freon (CCl₂F₂)? (C, 12; F, 19; Cl, 35)

(A) 18.2%

(B) 10%

(C) 9.1%

(D) 20%

(E) none of these

I got (B) 10%, is this correct?

Answer 1

C = 12

Cl₂ = 2(35) = 70

F₂ = 2(19) = 38

% carbon = 100 [12 / (12 + 70 + 38)] = 10%

You are correct.