A school has 1260 students. The ratio of the
number of girls to the number of boys is 2:3.
If 180 new students join the school, the ratio
changes to 5:7. How many new boys joined
the school?
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Answered by
33
Answer :-
84
Solution :-
Total no. of students = 1260
Ratio of no. of girls and boys = 2 : 3
Total parts = 2 + 3 = 5
No. of boys = 3/5 * 1260 = 756
If 180 new students joined
Total no. of students = 1260 + 180 = 1440
Ratio of no. of girls and boys = 5 : 7
Total parts = 5 + 7 = 12
No. of boys = 7/12 * 1440 = 840
No. of new boys joined = 840 - 756 = 84
Therefore, 84 new boys joined the school
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