The ratio of the number of boys to the number of girls in a school with 840 students was 7:5. In the new session, the number of boys increased by 20 and the ratio of boys to girls changed to 6.5. Calculate the number of new girls.
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total students-840
ratio-7:5
sum of ratio-7+5
=12
no of boys=7/12×840=490
no of girls=5/12×840=350
new no of boys=490+20=510
new no of girls =350+x
atp
510/350+x=6/5
5×510=6(350+x)
-6x=2100-2550
-6x=-450
x=450/6
x=75 girls
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