The ratio of three numbers is 6 : 5 : 9. If 20 percent of the first number is 30, then what would be 50 percent of the difference of third and second number?

50 30 45 40

50

Ratio = 6 : 5 : 9 Given that 20% of the first number (i.e. 6r) = 30 ⇒ $\frac{1}{5}$ x 6r = 30 ⇒ 1r = 25 Difference between third and second number = 4r = 4 × 25 = 100 50% of this number = 50