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emmaraeschool
23.09.2019 •
Mathematics
Every evening jenna empties her pocket and puts pockets and puts her change in a jar. at the end of the week she counts her money. one week she had 50 coins all of them were dimes and quarters. when she added them up she had a total of $10.25 let d=number of dimes and q=numbers of quarters. how many quarters did jenna have?
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Ответ:
You then have the equations, x+y=50 and 0.1x+0.25y=10.25
You can now solve for y.
Solving for y,
x=50-y
0.1(50-y)+0.25y=10.25
5-0.1y+0.25y=10.25
y=35
Ответ:
35 quarters
Step-by-step explanation:
This problem is a system of equations solving problem.
"one week she had 50 coins all of them were dimes and quarters":
We can write the equation as![d+q=50](/tpl/images/0254/2289/8c3c0.png)
"when she added them up she had a total of $10.25":
Since value of quarter is 0.25 dollars and dime is 0.10 dollar and total value is 10.25, we can write the equation as![0.1d+0.25q=10.25](/tpl/images/0254/2289/e9de1.png)
To solve both of this equation, we can multiply the first equation by -0.1 and then add the 2 equations and solve for q (shown below):
Hence, Jenna had 35 quarters.
Ответ:
the possible values of X,y are 45°,45°
405°,405°
Step-by-step explanation: