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Let the number of candies with Charu and Disha in the beginning be 7k and 5k respectively.
Candies with Disha after gave 4 candies to her = 5k + 4
After Charu stole from Disha:
Candies with Charu = 7k + (1/3)*(5k + 4) = (26k + 4)/3
Candies with Disha = (2/3)*(5k + 4)
So, (26k + 4)/3 : (10k + 8)/3 = 9:4
=> (26k + 4)/(5k + 4) = 9/2
=> 45k + 36 = 52k + 8
=> 7k = 28
=> k = 4
Number of Candies with Disha in the beginning = 5*4 = 20
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