SOLUTION: You have 100 coins that are only nickles and dimes. All the coins add up to 7.00. How many nickles do you have? How many dimes to you have?

SOLUTION: You have 100 coins that are only nickles and dimes. All the coins add up to 7.00. How many nickles do you have? How many dimes to you have?

Algebra.Com

Question 585457: You have 100 coins that are only nickles and dimes. All the coins add up to 7.00. How many nickles do you have? How many dimes to you have?
Answer by checkley79(3341) (Show Source): You can put this solution on YOUR website!

.05n+.10d=7
n+d=100
n=100-d
.05(100-d)+.10d=7
5-.05d+.10d=7
.05d=7-5
.05d=2
d=2/.05
d=40 number of dimes.
n+40=100
n=100-40
n=60 number of nickles.
PROOF:
.05*60+.10*40=7
3+4=7
7=7
RELATED QUESTIONS
you dump out your piggy bank and find that you have only nickels and dimes. there are a... (answered by mananth,MathTherapy,greenestamps)

if you have 100 coins which equal $8.00 worth of coins,how many nickles and dimes do you... (answered by josmiceli,greenestamps)

You have 23 coins totaling $2.75, how many quarters, nickles, and dimes do you... (answered by josgarithmetic,purpleoj,MathTherapy,ikleyn)

I have 34 coins that are dimes and nickles and equal $2.50. how many nickles do I... (answered by Cromlix)

cary has 15 coins, all dimes and nickles, worth $1.40. how many nickles does she... (answered by lynnlo)

you have 30 coins how many nickles and dimes does it take to make... (answered by ikleyn,Boreal)

you have 52 coins consisting of dimes and nickels the coins total $3.55 how many are... (answered by Edwin McCravy)

You have 28 coins that are all nickles and dimes. The value of the coins together is... (answered by oberobic)

Solution: solve for x and y. Moolah has 27 coins that are all dimes and nickles. The... (answered by JBarnum,TimothyLamb)