Linda had some chocolate bars. She sold 70% of her chocolate bars and gave half of the remainder to her brother. After that, she bought 37 chocolate bars and had a total of 49 chocolate bars in the end. How many chocolate bars did Linda have at first?
Percentage of chocolate bars that Linda left after selling 705 of her chocolate bars
= 100% - 70%
= 30%

Fraction of chocolate bars that Linda had left after giving to her brother
= ¹₂ x 30%
= ³₂₀

Number of chocolate bars that Linda had left = 3 u

Number of chocolate bars that Linda had in the end = 3 u + 37

3 u + 37 = 49
3 u = 49 - 37
3 u = 12

1 u = 12 ÷ 3 = 4

Total number of chocolate bars that Linda had at first
= 20 u
= 20 x 4
= 80

Answer(s): 80