The task is to generate the correct answer for a given math problem.

Problem: pipe a can fill a tank in 6 hours . due to a leak at the bottom , it takes 10 hours for the pipe a to fill the tank . in what time can the leak alone empty the full tank ?
15

Problem: what is the units digit of 26 ! + 50 ! + 4 ! + 4 ! ?
8

Problem: a dress on sale in a shop is marked at $ d . during the discount sale its price is reduced by 45 % . staff are allowed a further 40 % reduction on the discounted price . if a staff member buys the dress what will she have to pay in terms of d ?
0.33