It takes b minutes for Sylvia's bathtub to fill with water.

How many minutes will it take to fill 3 same-size bathtubs?
Write your answer as an expression.

2 answers

compare it to this:

It took me 12 minutes to paint a door,
how long would it take to paint 3 doors?
answer: it would take 3*12 or 36 minutes to paint the doors

it takes b minutes to fill 1 tub
how long to fill 3 tubs ?
.......
if your doing this for Kahn academy the answer is 3b or 3 x b