Question

Anita can iron a dress shirt in 15 minutes, but

it takes Michelle 18 minutes to do the same.

Working together, how many minutes will it take

them to iron 11 dress shirts?

Answer 1

The number of minutes it will take both of them to iron 11 dress shirt is 90 minutes

Rate:

Rate is the ratio between two related quantities in different units. Therefore,

Anita iron a shirt in 15 minutes. Therefore,

• rate  = 1 / 15

Michelle iron the same shirt for 18 minutes. Therefore,

• rate = 1 / 18

Let the time they use to work together = x

Therefore,

• 1  / x  = 1 / 15 + 1  / 18

1  / x =  18 + 15 / 270

1 / x = 33 / 270

cross multiply

270 = 33x

x = 270 / 33

x = 90 / 11

Both of them will use 90 / 11 minutes to iron a dress shirt

Therefore, 11 dress shirt will be ?

number of minutes to iron 11 dress shirt together = 11 × 90  / 11 = 90 minutes

learn more on rate here: https://brainly.com/question/1119145