When 75 is added to 75% of a number, the answer is the number.

When 75 is added to 75% of a number, the answer is the number. Find 40% of that number.

If the number be N, then

N ×	75	+ 75 = N
	100

⇒	3N	+ 75 = N
	4

⇒ N -	3N	+ 75
	4

⇒	N	= 75
	4

⇒ N = 4 × 75 = 300

∴ 40% of 300 =	300 × 40	= 120
	100