4. Systems
Applications Systems — Quiz
Test your understanding of applications systems with 5 practice questions.
Practice Questions
Question 1
A company sells two types of smartwatches: a basic model for $100$ and a premium model for $250$. If they sold a total of $120$ smartwatches and generated $21,000$ in revenue, how many premium smartwatches were sold?
Question 2
A boat travels $150$ miles downstream in $5$ hours and $90$ miles upstream in $6$ hours. What is the speed of the boat in still water?
Question 3
A chemist needs to mix a $10\%$ acid solution with a $40\%$ acid solution to obtain $12$ liters of a $25\%$ acid solution. How many liters of the $10\%$ acid solution are needed?
Question 4
A person invests a total of $10,000$ in two different accounts. One account earns $3\%$ annual interest and the other earns $7\%$ annual interest. If the total interest earned in one year is $580$, how much was invested in the account earning $3\%$ interest?
Question 5
A mixture of candies contains gummy bears costing $3$ per pound and chocolate bars costing $6$ per pound. If a $15$-pound mixture costs $4.20$ per pound, how many pounds of gummy bears are in the mixture?