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Maths Puzzle
Numerical Ability
Algebra
In a college the ratio of boys to girls is 31:23 . When 75 more girls join the college this ratio becomes 124:107. How many more girls shd join the college to make the number of boys and girls equal ?
a.75 b.90 c.60 d.85 e.none
Read Solution (Total 2)
-
- 31x / (23x+75) = 124/107
3317x=2852x+9300
465x=9300
x=20
ratio will be 620:460
when 75 more girls join in a college
620:460+75 = 620:535
Diff b/w boys & girls = 85
85 more girls to join in a college... - 9 years agoHelpfull: Yes(1) No(0)
- (31:23)*4 = 124:92......make boys equal to new ratio 124:107
124:92
124:107
107-92 = 15
124-107 = 17
15=75
17=85 - 8 years agoHelpfull: Yes(1) No(0)
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