Question

Bob takes 5 hours to lay 90 pieces of tile. Lucy takes 6 hours to lay 90 pieces of tile. One day, Lucy gets to the job site early and lays 12 pieces of tile before Bob arrives. Who will finish laying 90 tiles first? YOU MUST EXPLAIN YOUR ANSWER TO RECEIVE CREDIT.

*I WILL GIVE THE ANSWER 5 STARS AND MARK IT THE BRAINLIEST*

Answer 1

Answer:

Bob

Step-by-step explanation:

Lucy = 6 hours

Bob = 5 hours

90/6 = 15 tiles per hour for Lucy

90/5 = 18 tiles per hour for Bob

90-12 = 78 tiles

Bob still has 90

78/15 = 5.2 hours

90/18 = 5 hours for Bob

Bob will finish first.

Answer 2

Step-by-step explanation:

Bob 5 hours to 90 pieces 90/5=18/hour

Lucy 6 hours to 90 pieces 90/6=15/hour

Lucy 90-12=78 remaining bricks. 78 bricks divided by her 15 per hour. she has 5.2 hours remaining.

Bob will be completed first because he only takes 5 hours and even with her starting early, she will still have .2 left of time when he finishes at 5 hours.