Name:__________________________________________Date:________________________Period:________
Accelerated Algebra I
Section 7.7 Extra Practice
Solve.
1. A grocer has two kinds of candies. One costs $5/kg and another costs $4.20/kg. How many kilograms of
each type of candy should be mixed in order to get 60 kg of a mixture worth $4.80/kg?
2. A grocer mixed 12 lb of egg noodles costing $0.80/lb with 3 lb of spinach noodles costing $1.20/lb. What
will the cost per pound of the mixture be?
3. If you drive at 44 mi/h for 3 hours, how fast must you go during the next two hours in order to have an
average speed of 54 mi/h?
1
% annual interest and $3000 at 10% annual interest. What percent interest are
4
you earning on your total investment?
4. If you invest $8,000 at 6
5. How many liters of water must be added to 20 L of a 75% acid solution to produce a solution that is 15%
acid?
6. How many liters of pure acid should be added to 4 L of a 10% acid solution to make a solution that is 80%
acid?
7. A chemist mixes 16 L of a 40% acid solution and 24 L of a 16% acid solution. What is the percent of acid of
the mixture?
8. How many kilograms of water must be evaporated from 84 kg of a 5% salt solution to produce a solution
that is 35% salt?