A school has 630 students. The ratio of thenumber of boys to the numbe

1.	A school has 630 students. The ratio of thenumber of boys to the number of girls is 3:2. Thisratio changes to 7:5 after the admission of 90new students. Find the number of newly admittedboys.
Answer» initially total = 630boys:girls=3:2boys=378girls=252 now after admission of 90 total=630+90=720boys:girls=7:5so boys=420so girls=300so newly admitted boys=420-378=42

A school has 630 students. The ratio of thenumber of boys to the number of girls is 3:2. Thisratio changes to 7:5 after the admission of 90new students. Find the number of newly admittedboys.

Answer»

initially total = 630boys:girls=3:2boys=378girls=252

now after admission of 90 total=630+90=720boys:girls=7:5so boys=420so girls=300so newly admitted boys=420-378=42