Each week I save half my pocket money and I buy stamps for my collection with 1/3 of the pocket money. That leaves $3.21. How much do I spend on stamps?

Answer 1

x - .33x - .50x =3.21
x = 3.21/1.83
x = pocket money

Answer 2

PM -PM*1/2 -1/3 *PM=3.21
multiply both sides by 6
6PM-3PM-2PM=3.21*6
PM= 18.26

check that.

Answer 3

Joe. You erred above

x - .33x - .50x =3.21
x -.83x= 3.21
x=3.21/.17
x = pocket money