help with word problem

maggiemo

New member
Joined
Nov 3, 2010
Messages
1
Joe has 26 coins consisting of quarters and dollar coins. The total value is $17
The problem states that q=quarters. I'm supposed to write an equation ____________________________=17
to find out how many quarters.
I tried making a table, but I am confused about value vs number of coins and making a problem to solve it.
 

lookagain

Senior Member
Joined
Aug 22, 2010
Messages
2,376
maggiemo said:
Joe has 26 coins consisting of quarters and dollar coins. The total value is $17
The problem states that q=quarters. I'm supposed to write an equation ____________________________=17
to find out how many quarters.
I tried making a table, but I am confused about value vs number of coins and making a problem to solve it.
You have:

Let \(\displaystyle q =\) the number of quarters

Then \(\displaystyle 26 - q =\) the number of dollar coins

A value of a quarter is worth \(\displaystyle 0.25\) times the value of a dollar coin.

In this equation, we are leaving out the units of money in order not to clutter the equation as much.

You multiply the value of a coin by the number of each coin, respectively. Then you add those products

and set the sum equal to \(\displaystyle 17 \ (dollars).\)

The following equation includes representatiions of the total value of the quarters added
to the total value of the dollar coins to equal 17 dollars in total value.


\(\displaystyle 0.25q + 1(26 - q) = 17\)


Solve this equation for \(\displaystyle q\) to find out the number of quarters.
 
Top