Jenson has 10% as many marbles as Flynn. If Jenson gives away 20% of the marbles and Flynn gives away 50% of his marbles, they will have 348 marbles altogether. How many marbles do the two of them have?

	Jenson	Flynn	Total
Comparing Jenson and Flynn at first	1x5 = 5 u	10x5 = 50 u
Before	5x1 = 5 u	2x25 =  50 u
Change	- 1x1 = - 1 u	- 1x25 = - 25 u
After	4x1 = 4 u	1x25 = 25 u	348

10% = ¹⁰₁₀₀ = ¹₁₀

20% = ²⁰₁₀₀ = ¹₅ 

50% =⁵⁰₁₀₀ = ¹₂ 

The number of marbles that Jenson has at first is repeated.  Make the number of marbles that Jenson has the same.  LCM of 1 and 5 is 5 u.

The number of marbles that Flynn has at first is repeated. Make the number of marbles that Flynn has the same. LCM of 10 and 2 is 50 u.

Number of marbles in the end
= 4 u + 25 u
= 29 u

29 u = 348

1 u = 348 ÷ 29 = 12

Total number of marbles that the two of them have
= 5 u + 50 u
= 55 u
= 55 x 12
= 660

Answer(s): 660