Ivan had 60% fewer chocolate bars than Nick. After Nick gave 236 chocolate bars to Ivan, Ivan had ²₃ as many chocolate bars as Nick. How many chocolate bars did each of them have in the end?

1. Nick
2. Ivan

	Ivan	Nick	Total
Before	2x5 = 10 u	5x5 = 25 u	7x5 = 35 u
Change	+ 236	- 236
After	2x7 = 14 u	3x7 =  21 u	5x7 = 35 u

Number of chocolate bars that Ivan had at first in percentage
= 100% - 60%
= 40%

40% = ⁴⁰₁₀₀ = ²₅

The total number of chocolate bars at first and in the end remains unchanged. Make the total number of chocolate bars the same. LCM of 5 and 7 is 35.

Number of chocolate bars that Nick gave to Ivan
= 25 u - 21 u
= 4 u

4 u = 236

1 u = 236 ÷ 4 = 59

Number of chocolate bars that Ivan had in the end
= 14 u
= 14 x 59
= 826

Number of chocolate bars that Nick had in the end
= 21 u
= 21 x 59
= 1239

Answer(s): (a) 826; (b) 1239