Section 4.1 Ratio

The ratio of x to y can be written as x:y or in fraction form as .

Examples: Exercises on page 200.

2. Rewrite the ratio of 21:24 as a fraction.

ANSWER:

8. Rewrite the ration of 32 to 8 as a fraction with a denominator of 1.

ANSWER:

18. Soft drinks can be purchased in the following quantities at the indicated prices.

32 oz. for 37¢

48 oz. for 45¢

72 oz. for 99¢

Which is the best buy?

Find the unit cost for each (i.e., the cost per oz.)

32 oz. for 37¢

48 oz. for 45¢

72 oz. for 99¢

20. If the rear gear of a bicycle has 80 teeth and the drive gear has 15 teeth, what is the ratio of the teeth in the rear gear to those in the drive gear?

ANSWER:

26. The ratio of the lengths of the sides of a right triangle is 5:12:13. Find the length of each side if the perimeter is 270 cm.

5 + 12 + 13 = 30 (The total)

So the sides of the triangle are 45 cm., 108 cm., and 117 cm.

32. Use the figure below to write the ratio of the length of side b to that of side c.

B = 1
			A=
	The ration of side b to side c is