# Using Formulas To Solve Problems In this case, there are three people so the equation becomes: Step 2: Solve the equation created in the first step.

In this case, there are three people so the equation becomes: Step 2: Solve the equation created in the first step.This can be done by first multiplying the entire problem by the common denominator and then solving the resulting equation.

And we're almost there, we have a b multiplying by an h. So we get h-- and I'm just swapping the sides here.

If we want to just isolate the h, we could divide both sides of this equation by b.

Working alone Art does this work in 12 hours, so Art alone does 24/12 = 2 units an hour.

That means Rita will be doing 3 – 2 = 1 unit per hour. First, we will calculate B’s 10 days work, which he did alone.

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Let me draw a triangle just so we know what b and h are. So the formula is area is equal to 1/2 base times height. We essentially want to isolate the h on one side of the equation. So let's get rid of everything else on the right-hand side. So the best way to get rid of a 1/2 that's being multiplied by h is if we multiply both sides of the equation by its reciprocal.

So we can do it-- well, I'll do it one step at a time. If we multiply both sides of the equation by 2/1 or by 2. So let's multiply-- remember anything you do to one side of the equation, you also have to do to the other side of the equation. Well, the whole point behind multiplying by 2 is 2 times 1/2 is 1. If someone just gave you a bunch of areas and a bunch of base lengths, and they said keep giving me the height for those values, or for those triangles.

This can be done by first multiplying the entire problem by the common denominator and then solving the resulting equation. Click Here for Practice Problems Example 4 – One roofer can put a new roof on a house three times faster than another. How long would it take the faster roofer working alone?

This can be done by first multiplying the entire problem by the common denominator and then solving the resulting equation. Click Here for Practice Problems Example 5 – Triplets, Justin, Jason, and Jacob are working on a school project.

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