Question

A tin contains 28 kg of ghee. After consuming 2/7 of it, how much ghee is left in it?

Answer 1

total = 28kg
2/7 of it =
28*2/7

28        2            4           2    
----  x   ---   =      ---   x    ---    =         8
1           7             1          1

so 8kgs is eaten
left=28-8
     =20kg

Answer 2

A tin contain 28 kg of ghee.
1/7 part of it = 28/7 = 4 kg

2/7 part means = 4×2= 8 kg
7/7 - 2/7 = 28 - 8 = 20 kg.

∴ 20 kg of ghee is left in it.