1. Kevin and Randy Muise have a jar containing 45 coins, all of which are either

Question

1. Kevin and Randy Muise have a jar containing 45 coins, all of which are either quaters or nickels. The total value of the coins in the jar is $ 5.05. How many of each type of coin do they have?

2. Pratap Puri rowed 14 miles down a river in 2 hours, but the return trip took him 3 1/2 hours. Find the rate Pratap can row in still water and find the rate of the current. Let x = rate Pratap can row in still water and y = rate of the current.

3. Doreen Schmidt is a chemist. She needs to prepare 24 ounces of a 9% hydrochloric acid solution. Find the amount of 12% solution and the amount of 6% solution she should mix to get this solution.

Concentration rate -6% 12% 9% Ounces of SolutionOunces of Pure Acid First Solution H11 Second Solution 0.06x 0.12y 240.09(24) dede

Explanation / Answer

1) let quarter = q

nickel = n

n + q = 45

5n + 25q = 100 * 5.05

solving the equations

n = 45 - q

5 ( 45 - q) + 25 q = 505

q = 14

n = 31

so, nickels = 31 , quarters = 14

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