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Lostsunrise [7]
3 years ago
12

A piggy bank contains $5.45 in dimes and quarters. If the bank contains 29 coins, how many quarters are in the bank?

Mathematics
2 answers:
soldier1979 [14.2K]3 years ago
6 0
.1x + .25y = 5.45
x + y = 29

Multiply the second equation by -.1
 .1x + .25y = 5.45
-.1x - .1y  = -2.9  Now add the equations together, the x's will cancel.
------------------------
       .15y  = 2.55  Divide both sides by .15
         y = 17
29 - 17 = 12
12 dimes and 17 quarters

CHECK
12 * .1 + 17*.25 = $5.45
fredd [130]3 years ago
5 0
There are 12 dimes in there
 and 17 quaters
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Answer:

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Step-by-step explanation:

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Plug in values

11700=

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\frac{11700}{6900}=

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11700

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6900

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​  

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​  

 

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4380

 

\left(1.695652174\right)^{1/4380}=

(1.695652174)  

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\,\,\left[\left(1+\frac{r}{365}\right)^{4380}\right]^{1/4380}

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Raise both sides to 1/4380 power

1.000120571=

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-1\phantom{=}

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(  

365

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​  

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Multiply by 365

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4.4008415\%=

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