TIME & WORK -
APPROACH -
A Does a work in 10 days while B Does same work in 20 days and C does in 30 days . find in how many days they together will finish the whole work ?
60/11 days
55/11 days
70/11 days
65/11 days
SOL- Step 1- Take Lcm of all = 10, 20, 30 = 60
now , keep in mind that work is always fixed . here work is 60 unit or roti ( use your favourite word)
Step 2- find efficiency of each persons ( efficiency means in each day how many units work is finished)
eff of A = 60/10 = 6 u/day , eff off b = 60/20 = 3 u/day . eff of C= 60/30 = 2 u/day
Total eff = 6+3+2 = 11u/day
each day they together finished 11 unit so , no. of days to finish 60 unit work will be = 60/11 = 5 5/11 days
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