If $\frac{A}{2}=\frac{B}{3}=\frac{C}{7}$, then what is the value of the ratio (4A + 3B - C) : (A + B + C)?
Answer & explanation
Correct answer: option 2
A : B : C = 2 : 3 : 7
⇒ (4A + 3B - C) : (2 + 3 + 7)
⇒ (4(2) + 3(3) - 7) : (12)
⇒ 10 : 12 = 5 : 6.