Question

The ratio of number of boys and girls in a school of 720 students is 7 is to 5 how many more girls should be admitted to make the ratio as 1 is to 1

Answer 1

sum of ratio= 7+5 = 12
number of boys = (7/12)*720 =420
number of girls= REMAINING =720-420 = 300
TO MAKE 1:1 the number of girls should be increased to 120 = 300+120 =420
now boys:girls = 420:420 = 1:1
so the answer is 120 girls