Dorothy, Julia, and Robert go to the store to buy school supplies. Dorothy buys half as many pens as Julia. Julia buys three times as many pens as Robert. Robert buys 4 pens. If one pen costs $1.50, how much money did the three friends spend in total on pens?
Julia buys 4 * 3 = <<4*3=12>>12 pens
Dorothy buys 12/2 = <<12/2=6>>6 pens
The total number of pens purchased is 4 + 12 + 6 = <<4+12+6=22>>22 pens
The total cost of the pens is 22 * $1.50 = $<<22*1.5=33>>33
#### 33
human
Dorothy, Julia, and Robert go to the store to buy school supplies. Dorothy buys half as many pens as Julia. Julia buys three times as many pens as Robert. Robert buys 4 pens. If one pen costs $1.50, how much money did the three friends spend in total on pens?
gpt
Julia buys 4 * 3 = <<4*3=12>>12 pens
Dorothy buys 12/2 = <<12/2=6>>6 pens
The total number of pens purchased is 4 + 12 + 6 = <<4+12+6=22>>22 pens
The total cost of the pens is 22 * $1.50 = $<<22*1.5=33>>33
#### 33