SOLUTION: If Adam washes 12 dishes in 3.5 minutes how many dishes can he wash in 21minutes

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Question 509871: If Adam washes 12 dishes in 3.5 minutes how many dishes can he wash in 21minutes
Found 2 solutions by Maths68, MathTherapy:
Answer by Maths68(1474) About Me  (Show Source):
You can put this solution on YOUR website!
12 dishes...............3.5 minutes
12/12 dishes...............3.5/12 minutes
1 dish .................3.5/12 minutes
21*1 dish .................21*(3.5/12) minutes
21 dises................21*(3.5)/12 minutes
21 dises................7*(3.5)/4 minutes
21 dises................24.5/4 minutes
21 dises................6.125 minutes


Answer by MathTherapy(10552) About Me  (Show Source):
You can put this solution on YOUR website!
If Adam washes 12 dishes in 3.5 minutes how many dishes can he wash in 21minutes

Let the amount of dishes washed in 21 minutes be D

Just set up a proportion to determine the amount of dishes, as follows:

12%2F%28D%29+=+3.5%2F21

3.5D = 12(21) ------- Cross-multiplying

D, or amount of dishes washed in 21 minutes = %2812%2821%29%29%2F3.5, or 36%2F.5, or highlight_green%2872%29

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