Question

type 1 workers are 2.5 times as efficient as type 1 workers twelve type1 workers can complete a task in 10 days would have taken for 4 type 1 and 15 type 2 workers to do this work

Answer 1

12 Type1 workers completed=10 days
1 Type1 worker will complete=12*10=120 days
Since Type1 worker 2.5 times efficient than type2
1 type2 worker complete =2.5*120=300 days
Total unit of job=L.C.M of (120 & 300)=600
1 Type1 worker unit of job in one day=600/120=5
1 type2 worker unit of job in one day=600/300=2
Now, 4 Type1 workers job unit + 15 type2 workers job unit in one day=4*5+15*2=20+30=50
total time to complete job=600/50=12 days

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