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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.
Read Solution (Total 3)
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- After 15 girls leave ratio of boys and girls are in 2:1.
2x-45/x = 1/5 ==> hence, x=25 so number of girls at beginning is 25+15= 40 - 10 years agoHelpfull: Yes(0) No(1)
- 15 girls leave,B+(g-15)=0
- 8 years agoHelpfull: Yes(0) No(0)
- 15 girls leave,B+(g-15)=0
then,B=2*(g-15)---------------------->>>1
45 boys leave,(b-45)+(g-15)=0
then,(g-15)=5(b-45)
Hence,the number of girls in the beginning are,
5(b-45)-(g-15)=0------------------->>>2
put 1 in 2, we get,
5(2*(g-15)-45)-(g-15)=0
10g-150-225-g+15=0
9g-360=0
9g=360
g=40
****Yes,that's it....**** - 8 years agoHelpfull: Yes(0) No(0)
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