Posted by crissy on Monday, November 19, 2007 at 6:45pm.
Ben ran up three-fourths of the steps three at a time, one-sixth of the steps two at a time, and the final 10 steps one at a time. How many steps did Ben run up in all?
math - Michael, Monday, November 19, 2007 at 6:53pm
Let's write an equation to model this situation.
Let s be the number of total steps.
(3/4)s + (1/6)s + 10 = s
Collect the s's on one side.
10 = s - (3/4)s - (1/6)s
Find a common denominator, 12 in this case.
10 = (12/12)s - (9/12)s - (2/12)s
10 = s/12
Multiply both sides by 12.
120 = s
Now let's check our answer.
(3/4)s = (3/4)(120) = 90
Is it divisible by 3? Yes, 90/3 = 30.
(1/6)s = (1/6)(120) = 20
Is it divisible by 2? Yes, 20/2 = 10.
The answer is 120 steps.
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