Question 145028
1. A stack of nickels and dimes is worth $2.55. Find the number of nickels if the number of dimes is 12 less than twice the number of nickels.
Quantity equations:d = 2n -12
Value equation: 5n + 10d = 255 
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Rearrange:
2n - d = 12
n + 2d = 51
Use any method to solve for n and for d.
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2. Raul is 5 years older than twice Carols age. The sum of their age is 101. How old is Carols? 
Age equation:  R + C = 101
Age equation:  R = 2C + 5
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Rearrange:
R  +  C = 101
R  - 2C = 5
Use any method to solve for R and for C
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3. The perimeter of a rectangle is 3 inches less than twice the width. If the perimeter is 18 inches, find the width.
P = 18
P = 2w -3
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Solve for P and for w
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Cheers,
Stan H.