A's 1 day work: 110
B's 1 day work: 120
Step 1: A and B work for 4 days:
Work done = 4×(110+120)=4×320=35
Remaining work: 1−35=25
Step 2: A and C do remaining work in 2 days:
2×(110+1C)=25
Dividing both sides by 2:
110+1C=15
1C=15−110=110
⇒C=10
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