Question

3) If 2 men or 3 boys take 40 hours to do a certain piece of work, how long will 4 men and 9 boys working together take to complete the work?
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Answer 1

Step-by-step explanation:

100 HOURS

BECAUSE

2 MEN AND 3 BOYS TAKE 40 HRS

THEN

WE WOULD MULTYPLY IT WITH 2

SO THE ANSWER IS 80

AND IF ONLY 3 BOYS LEFT WE WILL DIVIDE IT WITH 2 SO REMAINING 40 We will DIVIDE BY 2 SO THE ANSWER IS 80+20 =100

Answer 2

Answer:

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2 men = 3 boys

1 men = 3/2 boys

so 4 men = 3/2 × 4 boys = 6 boys

now the problem is

3 boys can do a work in 40 hours

what time will 4 men and 9 boys take to complete the work

it means that 4 men = 6 boys

so 4 men and 9 boys = 6 boys + 9 boys = 15 boys

so the solution is,

3 boys = 40 hours

1 boy = 40 × 3 = 120 hours

15 boys = 120/15 hours = 8 hour