31. A and B can do a piece of work in 12 days, C and A in 20 days and B and C in 15 days then in how many days will they finish
it working together?
/ एक काम को A और B 12 दिन में, C और A 20 दिन में, B और C 15 दिन में पूरा करते हैं! यदि तीनों मिलकर एक साथ कार्य करे तो काम को
कितने दिन में परा करेंगे?
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Answer:
A+B =12 days
C+A = 15 days
B+C = 20 days
Work done =2(A)+2(B)+2(C) =6 (notes it)
Means= (1/12+1/15+1/20)
By taking LCM of 12,15,20
We get 60
Work done= 60/6
=10...
Therefore work done by A ,B ,C together is equal to 10 days*
Step-by-step explanation:
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