1) Let of no of coins with Claire = 2x
Let of no of coins with Bert = 3x
2x+3x = 5x --->x can take any value - Insufficient
2) No of coins can take any integer value from 21 to 28- Insufficient
1+2) Total no of coins must be a multiple of 5 & between 21 & 28. Only possible integer value is 25--->Sufficient
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