37. From a group of boys
and girls 15 girls leave. There are then left 2 boys for each girl. After this,
45 boys leave. There are then 5 girls for each boy. Find the number of girls in
the beginning.
Answer:
Let at present there be x
boys. Then number of girls at present = 5x.
Before the boys had left :
Number of boys = x+45 and number of girls = 5x.
=> x+45 = 2*5x =>9x = 45 => x=5.
Hence, number of girls in the beginning =
5x+15 = 25+15 = 40.
