Question

a man can plough a field alone in 20days. his wife can plough alone in 25 days. when they plough the field together with their son they can plough it in5 days. how many days would the son take if he were to plough the field alone?​

Answer 1

Answer:

30

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

LCM = 100

man efficiency = 100/20= 4

wife efficiency = 100/25=5

son efficiency =?

total efficiency = 100/5 = 20

so son efficiency = 20-4-5= 11

then son days = 100/11 = 9 1/11