Joelle had some chocolate bars. She sold 10% of her chocolate bars and gave half of the remainder to her sister. After that, she bought 41 chocolate bars and had a total of 149 chocolate bars in the end. How many chocolate bars did Joelle have at first?
Percentage of chocolate bars that Joelle left after selling 105 of her chocolate bars
= 100% - 10%
= 90%

Fraction of chocolate bars that Joelle had left after giving to her sister
= ¹₂ x 90%
= ⁹₂₀

Number of chocolate bars that Joelle had left = 9 u

Number of chocolate bars that Joelle had in the end = 9 u + 41

9 u + 41 = 149
9 u = 149 - 41
9 u = 108

1 u = 108 ÷ 9 = 12

Total number of chocolate bars that Joelle had at first
= 20 u
= 20 x 12
= 240

Answer(s): 240