Perry has 10% as many erasers as Liam. If Perry gives away 25% of the erasers and Liam gives away 30% of his erasers, they will have 341 erasers altogether. How many erasers do the two of them have?

	Perry	Liam	Total
Comparing Perry and Liam at first	1x4 = 4 u	10x4 = 40 u
Before	4x1 = 4 u	10x4 =  40 u
Change	- 1x1 = - 1 u	- 3x4 = - 12 u
After	3x1 = 3 u	7x4 = 28 u	341

10% = ¹⁰₁₀₀ = ¹₁₀

25% = ²⁵₁₀₀ = ¹₄ 

30% =³⁰₁₀₀ = ³₁₀ 

The number of erasers that Perry has at first is repeated.  Make the number of erasers that Perry has the same.  LCM of 1 and 4 is 4 u.

The number of erasers that Liam has at first is repeated. Make the number of erasers that Liam has the same. LCM of 10 and 10 is 40 u.

Number of erasers in the end
= 3 u + 28 u
= 31 u

31 u = 341

1 u = 341 ÷ 31 = 11

Total number of erasers that the two of them have
= 4 u + 40 u
= 44 u
= 44 x 11
= 484

Answer(s): 484