Jenson is 40 years older than his niece. 10 years from now, his niece will be ¹₂ of his age while his nephew will be ³₅ of his niece. Express his nephew’s present age as a fraction of Jenson's present age. Leave your answer in its simplest form.

	Jenson	Jenson's niece	Jenson's nephew	Difference between Jenson and Jenson's niece
Before	10 u - 10	5 u - 10	3 u - 10	40
Change	+ 10	+ 10	+ 10
After	2x5	1x5
		5x1	3x1
Comparing Jenson, his niece and his nephew in the end	10 u	5 u	3 u	5 u

The repeated identity is the age of Jenson's niece. LCM of 1 and 5 is 5.

The difference in age between Jenson and Jenson's niece remains unchanged.

Difference in age between Jenson and Jenson's niece
= 10 u - 5 u 
= 5 u 

5 u = 40

1 u = 40 ÷ 5 = 8

His nephew's present age 
= 3 u - 10
= 3 x 8 - 10
= 24 - 10
= 14

Jenson's present age
= 10 u - 10
= 10 x 8 - 10
= 80 - 10
= 70

His nephew's present age as a fraction of Jenson's present age
= ¹⁴₇₀
= ¹₅

Answer(s): ¹₅