Sid takes $48 with him on a shopping trip to the mall.  He spent some of his money on computer accessories and another $8 on snacks. After these purchases, he only has $4 more than half of his original money left. How much did he spend on computer accessories?
Half of Sid's original money is $48/2 = $<T>divide(48, 2)=24.0
Sid has only $24 + $4 = $<T>add(24, 4)=28 left after his purchases.
He had $28 + $8 = $<T>add(28, 8)=36 before he spent $8 on snacks.
So, Sid spent $48 - $36 = $<T>subtract(48, 36)=12 on computer accessories.
