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If at first there were 10u pupils, 8u were boys and 2u were girls.

After 15 girls entered the library, there were ( 10u + 15) pupils and ( 2u + 15) girls.

( 10u + 15) * 60/100 = 2u + 15

( 10u + 15) * 3/5= 2u + 15               multiply both sides by 5

30u + 45 = 10u + 75

20u = 30

u = 1.5

10u + 15 = 30

There were 30 pupils in the library now. 

 

 

 

Check: 2u + 15 = 18 

18/30 = 3/5 = 60% checked.

 

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