There are three fourths of tons of coal in the canteen. Two fifths of them are used. How many tons are left?

There are three fourths of tons of coal in the canteen. Two fifths of them are used. How many tons are left?

3/4—2/5
= 15/20—8/20
=7 / 20 (ton)
A: there are still 7 / 20 tons of coal left

There are three fourths tons of coal in the canteen. How many tons are left after two fifths of the coal is used

0.35t

There are three fourths of coal in the canteen, and three fourths are left after using part of it. How much coal do you use?

3 / 4 × (1-3 / 4) = 3 / 16 tons

There are four fifths of coal in the canteen. After using part of it, there are three fourths left. How many tons are left

4 / 5 × 3 / 4 = 3 / 5 (ton)