A basket contained green and pink erasers. There were 60% more green erasers than pink erasers. When 26 more erasers were poured into the basket, the amount of green erasers increased by 25% and the amount of pink erasers increased 90%. How many erasers were in the basket at first?

	Green erasers	Pink erasers	Total erasers
Before	8 u	5 u	13 u
Change	+ 2 u	+ 4.5 u	+ 6.5 u
After	10 u	9.5 u	19.5 u

100% + 60% = 160%

160% = ¹⁶⁰₁₀₀ = ⁸₅

Number of more green erasers that were poured into the basket
= 25% x 8 u
= ²⁵₁₀₀ x 8 u
= 2 u

Number of more pink erasers that were poured into the basket
= 90% x 5 u
= ⁹⁰₁₀₀ x 5 u
= 4.5 u

Total number of more erasers that were poured into the basket
= 2 u + 4.5 u
= 6.5 u

6.5 u = 26

1 u = 26 ÷ 6.5 = 4

Number of erasers in the basket at first
= 8 u + 5 u
= 13 u
= 13 x 4
= 52

Answer(s): 52