a school has 630 students .the ratio of number of boys to number of girls is 3:2 .this ratio changes to 7:5 after the admission of 90 new students .find newly admitted boys
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118
no. of boys=630*3/5=378
no.of girls=630*2/5=252
no. of new admitted boy=x
new admitted girl=90-x
(378+x)/(252+(90-x))=7/5
1890+5x=1764+630-7x
12x=2394-1890
x=42
new admitted boys =42
no.of girls=630*2/5=252
no. of new admitted boy=x
new admitted girl=90-x
(378+x)/(252+(90-x))=7/5
1890+5x=1764+630-7x
12x=2394-1890
x=42
new admitted boys =42
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58
Answer:42
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