# math

posted by .

Select the equation that solves this problem:
Eight coins (dimes and quarters) are worth 170 cents. How many dimes are
there?
a. 10d + 25(11 - d) = 170
b. 10d + 25(8 - d) = 170
c. 10d + 5(8 - d) = 60
d. 10d + 5(11 - d) = 60

• math -

So what do you think?

• math -

I send to you solution for simmilar problem.

• math -

A quarters is worth 25 cents and a dime is worth 10 cents.

q = numbers of a quarters

d = numbers of a dimes

q + d = 8

q = 8 - d

Value of money :

10 ¢ * d + 25 ¢ * q = 170 ¢

10 d + 25 q = 170

10 d + 25 ( 8 - d ) = 170

Equation b.

10 d + 25 ( 8 - d ) = 170

10 d + 25 * 8 + 25 * ( - d ) = 170

10 d + 200 - 25 d = 170

10 d - 25 d = 170 - 200

- 15 d = - 30 Divide both sides by - 15

d = - 30 / - 15

d = 2

q = 8 - d = 8 - 2 = 6

2 dimes and 6 quarters

2 * 10 ¢ + 6 * 25 ¢ =

20 ¢ + 150 ¢ = 170 ¢

## Similar Questions

1. ### algebra

How do I figure out this problem? You have 37 coins (all nickels , dimes, and quarters) adding up to \$5.50. You have 4 more quarters than nickels. How many dimes do you have?
2. ### math,correction

Number problems. You have at least \$30 in change in your drawer, consisting of dimes and quarters. Write an inequality that shows the different number of coins in your drawer. okay this is what i have: Let “d” be the number of …
3. ### math

marcy has a total of 100 dimes and quarters. if the total value of the coins is \$14.05, how many quarters does she have?
4. ### algebra/math

Rico's collection of quaters and dimes contains \$32.85. There are 171 coins in all How many quarters and how many dimes are in Rico's collection?

Rico's collection of quaters and dimes contains \$32.85. There are 171 coins in all How many quarters and how many dimes are in Rico's collection?
6. ### Math

Lianne has nineteen coins worth \$1.45. Some coins are dimes & the rest are nickels. How many dimes does she have. I understand the D + N = 19 & the 10D + 5N = 145, but I don't understand how you'd subtract them from each other?
7. ### math

Select the equation that solves this problem: Eight coins (dimes and nickels) are worth 60 cents. How many dimes are there?
8. ### Math

Fehima has 4 times as many dimes as quarters.If her dimes and quarters have a value of \$3.90, how many of each coin does she have?
9. ### word problem math

Keith has p pennies, n nickels, and d dimes in his pocket. The total number of coins is 9. The expression 0.01p+0.05n+0.10d0.01p+0.05n+0.10d represents the value of the coins, which is equal to \$0.53. He has two fewer nickels than …