Q.
The average number of boys and girls in a class is 75 and the number of boys and girls in the class is increased by 20% and 40% respectively. If the total number of students in the class is increased by 40, then find the number of boys in the class initially?<\/p>
a) 200<\/p>
b) 150<\/p>
c) 100<\/b><\/p>
d) 50<\/p>
e) None of these<\/p>
Sol:<\/p>
The total number students in the class = 75 * 2 = <\/p>
150<\/p>
Let the number of boys in the class = x <\/p>
And the number of girls in the class = 150 \u2013 x <\/p>
x * 20\/100 + (150 \u2013 x) * 40\/100 = 40 <\/p>
x\/5 + 60 \u2013 2x\/5 = 40 <\/p>
x\/5 = 20 <\/p>
x = 100 <\/p>
The number of boys in the class initially = 100<\/p> <\/p>\n","protected":false},"excerpt":{"rendered":"
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