ATAR Calculation Fundamentals 3

Question 1

What is the value of √(144) + √(25)?

Accepted Answer

17

Answer

√144 = 12 and √25 = 5, so 12 + 5 = 17.

Question 2

A shirt costs $45 after a 25% discount. What was the original price?

Accepted Answer

$60.00

Answer

If $45 is 75% of the original price, then original = 45 ÷ 0.75 = $60.00.

Question 3

What is the least common multiple (LCM) of 12 and 18?

Accepted Answer

36

Answer

The LCM of 12 and 18 is 36 (12×3 = 36 and 18×2 = 36).

Question 4

Solve for x: 4x − 7 = 21

Accepted Answer

x = 7

Answer

4x = 21 + 7 = 28, so x = 28 ÷ 4 = 7.

Question 5

A recipe requires 2.5 cups of flour to make 20 cookies. How many cups are needed for 48 cookies?

Accepted Answer

6.0 cups

Answer

Ratio: 2.5/20 = x/48; x = 2.5 × 48/20 = 120/20 = 6.0 cups.

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