CAST Math 4

Question 1

Using Ohm's law, what current flows when 120 volts is applied across a 30-ohm resistance?

Accepted Answer

4 amps

Answer

Current = voltage ÷ resistance = 120 ÷ 30 = 4 amps.

Question 2

A blueprint scale is 1 inch = 8 feet. How many feet does a 4.5-inch line represent?

Accepted Answer

36 feet

Answer

4.5 × 8 = 36 feet.

Question 3

What is the average of 12, 18, 24, and 30?

Accepted Answer

21

Answer

The sum is 84, and 84 ÷ 4 = 21.

Question 4

A circle has a radius of 7 inches. Using 3.14, what is its circumference?

Accepted Answer

43.96 in

Answer

Circumference = 2 × 3.14 × 7 = 43.96 inches.

Question 5

If a price rises from $50 to $65, what is the percent increase?

Accepted Answer

30%

Answer

The increase is $15, and 15 ÷ 50 = 0.30, or 30%.

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