A basket contained yellow and pink erasers. There were 60% more yellow erasers than pink erasers. When 110 more erasers were poured into the basket, the amount of yellow erasers increased by 25% and the amount of pink erasers increased 70%. How many erasers were in the basket at first?

	Yellow erasers	Pink erasers	Total erasers
Before	8 u	5 u	13 u
Change	+ 2 u	+ 3.5 u	+ 5.5 u
After	10 u	8.5 u	18.5 u

100% + 60% = 160%

160% = ¹⁶⁰₁₀₀ = ⁸₅

Number of more yellow 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
= 70% x 5 u
= ⁷⁰₁₀₀ x 5 u
= 3.5 u

Total number of more erasers that were poured into the basket
= 2 u + 3.5 u
= 5.5 u

5.5 u = 110

1 u = 110 ÷ 5.5 = 20

Number of erasers in the basket at first
= 8 u + 5 u
= 13 u
= 13 x 20
= 260

Answer(s): 260