Question

3
John had some pencils. of them
5
were red and the rest were green. He
2
1
gave of the red pencils and of
3
4
the green pencils to his sister. If he
had 80 pencils left, how many pencils
did he have at first?​

Answer 1

Answer:

red = 3x/5

green= (x-3x/5)=2x/5

red pencil given to sister = 2/3*3x/5 = 2x/5

red pencil left = 3x/5-2x/5 = x/5

green pencil given to sister = 1/4*2x/5 = x/10

green pencil left= 2x/5-x/10 =3x/10

total pencil left =  x/5 + 3x/10 = x/2

A/C, x/2=80

      x= 160.

hope this helps you please follow me