Hamid has gained weight

He now weighs 88kg, which is 10% higher than his normal weight.

What is Hamid's normal weight?

If we let x be Hamid's normal weight, 10% of the normal weight can be expressed as 0.10x. The equation that would let us better visualize the problem,

(1.10) x = 88

The value of x from the equation is 80.

Therefore, the answer is 80 kg.