If (9g + 2h) : (9g - 2h) = 9 : 2. then what is the value of g : h?
Answer & explanation
Correct answer: option 1
(9g + 2h) : (9g - 2h) = 9 : 2
$\frac{9g+2h}{9g-2h} = \frac{9}{2}$
divide the numerator and denominator in LHS by h,
⇒ $\frac{9\frac{g}{h}+2}{9\frac{g}{h}-2} = \frac{9}{2}$
let $\frac{g}{h}$ = R,
⇒ $\frac{9R+2}{9R-2} = \frac{9}{2}$
⇒ (9R+2) x 2 = (9R-2) x 9
⇒ 18R + 4 = 81R - 18
⇒ 63R = 22
⇒ R = $\frac{22}{63}$
Thus, g : h = 22 : 63