If 50% of (x-y)=30% of (x+y) then what percent of x is y?

7.  If 50% of (x-y)=30% of (x+y) then what percent of x is y?

A. 25%
B. 50%
C. 75%
D. 100%

ANS: A

EXPLANATION:

50/100 (X-Y) = 30/100 (X+Y)
1/2 (X-Y) = 3/10 (X+Y)
½ X - 3/10 X = 3/10 Y + 1/2 Y
2/10 X = 8/10 Y
Y = ¼ X
¼= 25%

8. 30 percent of a number is 15 less than 3/5th of a number. What is the number?

A. 48
B. 52
C. 50
D. 70

ANS: C

EXPLANATION:

30/100 X = 3/5 X – 15
 3/10 X – 3/5 X = 15
3/10 X = 15
X = 50

கருத்துரையிடுக

0 கருத்துகள்
* Please Don't Spam Here. All the Comments are Reviewed by Admin.