PDA

View Full Version : sat math percentages

lily
10-25-2013, 07:47 PM
If 20% of a is equal to 40% of b and b=24, what is the value of a?

(A) 6

(B) 12

(C) 24

(D) 48

Thanks

10-25-2013, 07:48 PM
The 40% of b where b=24 is equal to 0.4 \cdot 24=9.6 .

The 20% of a is equal to 0.2 \cdot a=9.6 \Rightarrow

a=\frac{9.6}{0.2}=48

Therefore the correct answer is (C).
Hope these help!!

lily
10-25-2013, 07:48 PM
Thank you:D