25.

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