Winnie had some caramel apples. She sold 10% of her caramel apples and gave half of the remainder to her sister. After that, she bought 30 caramel apples and had a total of 66 caramel apples in the end. How many caramel apples did Winnie have at first?
Percentage of caramel apples that Winnie left after selling 105 of her caramel apples
= 100% - 10%
= 90%

Fraction of caramel apples that Winnie had left after giving to her sister
= ¹₂ x 90%
= ⁹₂₀

Number of caramel apples that Winnie had left = 9 u

Number of caramel apples that Winnie had in the end = 9 u + 30

9 u + 30 = 66
9 u = 66 - 30
9 u = 36

1 u = 36 ÷ 9 = 4

Total number of caramel apples that Winnie had at first
= 20 u
= 20 x 4
= 80

Answer(s): 80