Question

Four men if working together on a job can complete it in 1 week. If the job is to completed in 4 days, how many more men are required to do the job?

Answer 1

4m=7d
xm=4d

Answer 2

where x=(n-4)

Answer 3

solve the first equation for m
ie
m=4/7 d

substitute into the second equation
x(4/7 d )=4d
x=7


n=3

Answer 4

thanks (:

Answer 5

can you decipher all my letters

Answer 6

yes

Answer 7

a question similar to this, @UnkleRhaukus , Six staff can finish a task in five days. How my days would it take four staff?

Answer 8

6s=5d
4s=?d

Answer 9

solve the first equation for s(d)

Answer 10

i am not going to do it this time
but i can tell you what to do if you get stuck

Answer 11

s=

Answer 12

errr so that would be s= 6/5?

Answer 13

and then

Answer 14

\[s=\frac56 d\]

Answer 15

substitute s into\[4s=?d\]the divide both sides by d

Answer 16

\[4\times\frac{5}{6}d=?d\]
\[\frac {10}{3}d=?d\]
\[\frac {10}{3}=?\]

Answer 17

ohhh i did that but the multiple choice questions didn't have the answer 3.33

Answer 18

what are the options?

Answer 19

6.5 days, 7 days, 8 days or 8.5 days

Answer 20

i think it should be longer than 5 days....but I'm not sure how to work it out

Answer 21

you are right it should take more that 5 days

Answer 22

Six staff can finish a task in five days.
\[6s\times5d=t\]How my days would it take four staff?\[4s\times ?d=t\]
\[30sd=4?sd\]\[7.5sd=?sd\]\[7.5=?\]

still not one of the options
i must be doing something wrong

Answer 23

ahaha, do you know how i can do it or..?

Answer 24

if 7.5 days is the answer you got, then its good enough for me!

Answer 25

they probably did it wrong in the book