Question

Can somebody show me how to do this??

If c carpenters can a build a garage in d days, how many days will it take e carpenters, working at the same rate, to build 2 garages?

I know the answer is 2cd/e (thanks to gsmafra ^^), but I would like to see the steps, please. SAT math ftw~

Answer 1

i think proportions play a part

Answer 2

Suppose you can make that relation:
(Number of carpenters)*(Days of work) = (Garages built)*(Constant)

c*d = 1*α (Situation 1)
e*n = 2*α (Situation 2)

Replacing the constant α = c*d in Situation 2 to find n:
e*n = 2*c*d

n = 2cd/e

Answer 3

e.1.x=c.2.d ====> x= 2cd/e

Answer 4

this is 3 prportions problem

Answer 5

is that clear to you?

Answer 6

Yes. Thanks!

Answer 7

you are welcome