5 men or 7 women or 9 girls can do a piece of work in 15 days. How many days will 1 men 1 women and 1 girl take to do the same
work?
In cummor camn food was available for 120 children at the rate of​

Step-by-step explanation:

5 men × 15 days = 75 man-days

Each man does 1/75 of the job per day

7 women × 15 days = 105 woman-days

Each woman does 1/105 of the job per day.

9 girls × 15 days = 135 girl-days

Each girl does 1/135 of the job per day.

Least common multiple of 75, 105, and 135 =

Working together, 1 man, 1 woman, and 1 girl do 1/75 + 1/105 + 1/135 = 143/4725 of the job per day, finishing in 4725/143 = 33.04 days

2nd one in the first row is correct

it is contrapositive

i could not see the question too well so check yourself again too . this is because i want you to get it correct.