There are 3 brothers adam ben and callum callum is 3/8 of adams age ben is 4/5 of adams age given that callum is 2 years younger than ben find adams age

Let x =  Adam's age.

Callum is 3/8 of Adam's age.
Therefore Callum's age is (3/8)x.

Ben is 4/5 of Adam's age.
Therefore Ben's age is (4/5)x.

Callum is 2 years younger than Ben, therefore
(3/8)x = (4/5)x - 2
Multiply through by 40.
15x = 32x - 80
-17x = -80
x = 4.706

Adam's age is 4 years, 0.706*12 months = 4 years, 8.5 months

4 years, 8.5 months

Technically speaking, histograms are another version of bar charts, if you need to work one out then skim through google hope-o that -o!