Rafael spent

3
5
of his allowance on food and
1
4
on transportation. If he has ₱1000 allowance in a week, how much is left for him?

write fractions this way: 3/5

So he spent 3/5 + 1/4 or 17/20 of his allowance, leaving him with 3/20

(3/20)(1000) = 150