**1) If 5 pencils cost 20 cents, how much would 15 pencils cost?**

Let x be the cost of pencils (15 of them)

Word ratio, ratio table, find x (cross product)

The cost of 15 pencils, would be 60 cents.

**2) Darrell drove 187 miles in 3 hours. What was Darrell's average rate of speed in miles per hour?**

Let x be the average rate of speed in one hour

Word ratio, ratio table, find x (cross product)

**A word problem for you:**

The ratio of 7th graders to 8th graders participating in the science fair is 4:3. There are 18 eighth graders participating in the science fair. How many seventh graders are there?

The answer for your question is:

ReplyDelete~There would be 24 7th graders. (I got the answer by doing cross multiplication.)

7th graders: 8th graders

ReplyDelete4 : 3

x : 18

3(x) = 4(18)

3x = 72

3x/3 = 72/3

x = 24

There are 24 7th graders.