Jimmy spent $1.5 on candy bars because 2 x .75 = <<2*.75=1.5>>1.5
He spent $1 on lollipops because 4 x .25 = <<4*.25=1>>1
He spent $2.5 in total because 1.5 + 1 = <<1.5+1=2.5>>2.5
He earned $15 shoveling driveways because 2.5 / (1/6) = <<2.5/(1/6)=15>>15
He shoveled 10 driveways because 15 / 1.5 = <<15/1.5=10>>10
#### 10