1.
A mixture costs $3.20 per kg. It is made by mixing two types of rice costing $4 and $2.5 per kg respectively. What is the ratio of the cheaper to the costlier variety?
2.
A company’s average production was 20 units for x months and 40 units for y months. If the overall average was 28 units, what is the ratio x : y?
3.
A company has 4 branches, each earning an average of $50,000 per month. If one branch closes and the remaining branches maintain the same total revenue, what is the new average monthly earning per branch?
4.
A team’s average score in 8 games is 45. In the 9th game, they score 30. What is the new average?
5.
A tank is filled over 4 days with daily inputs of 10L, 20L, 30L, and 40L. What is the average daily input?
6.
The numbers 4, 6, 7, 10, 12, and x are arranged in increasing order. If the average equals the median, what is x?
7.
If the average of 7 consecutive even integers is 60, what is the largest integer?
8.
A person needs to run 80 km over 5 days. If the distance he runs each day differs by no more than 4 km, what’s the most he can run on Day 5?
9.
A 300 L solution has milk and water in a ratio of 5:1. How much water must be added to make the ratio 5:2?
10.
If 60% of tasks are reviewed by Emma and 40% by Liam, and their error detection rates are 1% and 2% respectively, what is the overall detection rate?
