Question

Johnny can build 3 1/2 lego planes in 60 minutes. How many can he build in 40 minutes? Simplify answer completely

Answer 1

2
`(1)/(3)` planes

Explanation:

Set up a ratio.

planes over time.

Because the time is given in minutes. No conversion necessary.

`(planes)/(time)` =
`(3.5)/(60)` =
`(x)/(40)`

Cross Multiply

60 (x) = 3.5 (40)

60x = 140 Divide by 60, both sides.

x = 2.333 repeating also know as 2
`(1)/(3)`.