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# 1Math 50 : Elementary Algebra - page 5 / 15

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How many pounds of walnuts that cost \$2 per pound must be mixed with 20 lb of cashews that cost \$5 per pound to make a mixture that sells for \$2.75 per pound?

Amount

Unit Cost

Value

\$2 walnuts

2

\$5 cashews

20

5

\$2.75 mixture

2.75

26.

How many gallons of a 15% acid solution and 20% acid solution must be mixed to make a 20 gallons of 16% acid solution?

Solution

Amount

Percent

Quantity (pure acid)

15% acid

.15

20% acid

.20

16% acid

20 gal

.16

27.

An investment counselor for a corporation invested 70% of the

company’s investment account in 6.54% short-term certificates. The remainder was invested in 6% corporate bonds. The annual interest earned from the two investments was \$127,560. What was the total amount invested?

Principal

Rate

Interest

@6.54%

.0654

@6%

.06

Total

\$127,560

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