SATs Problem Solving & Data Interpretation 2

Question 1

A store sells apples at a rate of 3 for $1.20. At this rate, what is the cost of 10 apples?

Accepted Answer

$4.00

Answer

Each apple costs $1.20 ÷ 3 = $0.40, so 10 apples cost $0.40 × 10 = $4.00.

Question 2

A population of bacteria doubles every 3 hours. If there are initially 500 bacteria, how many will there be after 9 hours?

Accepted Answer

4,000

Answer

In 9 hours there are 3 doubling periods, so 500 × 2³ = 500 × 8 = 4,000.

Question 3

The mean of five numbers is 14. If four of the numbers are 10, 12, 16, and 18, what is the fifth number?

Accepted Answer

14

Answer

The total sum must be 14 × 5 = 70; the four known numbers sum to 56, so the fifth is 70 − 56 = 14.

Question 4

A survey of 200 students found that 60% prefer online learning. How many students prefer online learning?

Accepted Answer

120

Answer

200 × 0.60 = 120 students prefer online learning.

Question 5

A bag contains 4 red, 6 blue, and 10 green marbles. What is the probability of randomly selecting a blue marble?

Accepted Answer

3/10

Answer

There are 6 blue marbles out of 4 + 6 + 10 = 20 total, so P(blue) = 6/20 = 3/10.

SATs (Standard Assessment Test) Practice Test