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

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for

the probability that a bird is green (.30) is true

step-by-step explanation: