<human>:  Billy is buying some candy with $10 his father gave him. The candy costs $1.5 a pound. After buying candy, he takes half his change and spends it on gumballs, which cost $.05 each. If he bought 40 gumballs, how many pounds of candy did he buy?
<bot>: How much did Billy spend on gumballs? ** He spent $2 on gumballs because 40 x .05 = <<40*.05=2>>2
How much change did Billy have? ** He had $4 in change because 2 / .5 = <<2/.5=4>>4
How much did Billy spend on candy? ** He spent $6 on candy because 10 - 4 = <<10-4=6>>6
How many pounds of candy did Billy buy? ** He bought 4 pounds of candy because 6 / 1.5 = <<6/1.5=4>>4
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