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avatar+701 

sally has seven times as many dimes as nickles their value is $3.00 how many nickles does she have 

 Nov 26, 2018
 #1
avatar+107348 
+1

Let the number of nickles = N

Then....the number of dimes = 7N

 

And

 

No. of nickles * their value each  + No. of dimes * their value each =  total value

 

So we have

 

N(5) + 7N(10 )  = 300        simplify

 

5N + 70N     =  300

 

75N =  300        divide both sides by 75

 

4 = N     ⇒    [ 4 nickles ]

 

 

cool cool cool

 Nov 26, 2018
 #2
avatar+701 
0

how did you get the 5 and 10

 Nov 26, 2018
 #3
avatar+107348 
+1

Each nickel is wort 5 cents, and each dime is worth 10 cents

 

So

 

4 nickels * 5cents   +   7(4) dimes * 10 cents =

 

20 cents +   28 * 10 cents =

 

20 cents + 280 cents =

 

300 cents =

 

$3.00

 

 

cool cool cool

CPhill  Nov 26, 2018

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