The ratio of the boys to girls in a class is 2 : 3. If 20% of boys leave this class, then the new ratio of boys to girls is
8 : 15
8 : 3
3 : 7
4 : 7
A
4 : 7
B
8 : 3
C
8 : 15
D
3 : 7
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Solution
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Let the total number of students=100 Ratio of boys and girls=2:3 2+3=5 No. of boys =25×100=40 No. of girls=35×100=60 If 20% of the boys leaves the class then 20% of 40 20100×40=8 Now number of boys=40−8=32 New ratio=32:60⇒8:15
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