John spent 2/3 of his money on a pen and a calculator. The calculator cost 3 times as much as the pen. if the calculator cost $24, how much money did he have left?

C=3 times p

c=3p

c=24

24=3p

divide both sides by 3

8=p

2/3 of money=c+p

2/3 of money=24+8

2/3 of money=32

how much he had left

all-2/3=1/3

so

2/3 of money = 32

divide both sides by 2

1/3 of money=16

he had $16 left

24 calculator 8 pens so 32 all together he had 16 dollars left because the fraction is 32/48 equals 2/3