grade 9 math!!!!!!!!!! please help

posted by .

lavre has sixty-one coins, all of whichare dimes and quaters. if the total value of the coins is $9.85, how many of each kind of coins has she?

  • grade 9 math!!!!!!!!!! please help -

    If Q = # quarters
    and D = # dimes.
    Then
    Q+D=61
    .25Q+.10D=9.85
    =================
    Two equations and two unknowns. Solve for Q and D. Check my work.

  • grade 9 math!!!!!!!!!! please help -

    Q = 25
    D = 36
    It's a system of linear equations so you can put it into a matrix to solve
    let Matrix A be a 2x2 matrix
    |1 1|
    |.25 .1|
    and have another matrix, B
    |61 |
    |9.85|
    A^-1 * B will give you the answer

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. math

    lavere has sixty-one coins, all of which are dimes and quaters. if the total value of the coins is $9.85, how many of each kind of coins has she?
  2. 4th grade

    Bobby has only pennies, dimes, and quarters. One half of Bobby's coins are pennies. One fourth of his coins are quarters. Three of his coins are dimes. How many coins does Bobby have?
  3. Math

    Laverne has sixty-one coins, all of which are dimes and quarters. If the totoal value is $9.85, how many of each kind of coin she has?
  4. Math

    Shirley has 18 coins. One sixth of the coins are quarters, one third of the coins are dimes, and one half of the coins are nickels. What is the value of Shirley's coins?
  5. Math

    A bag contains forty coins, all of them either 2c or 5c coins. Let there be x 2c coins and y 5c coins. If the value of money in the bag is $1.55, find the number of each kind.
  6. maths

    A bag contained a number of 20cents, 50cents and $1 coins. 1/3 of the 20cents coins is equal to 2/3 of the 50cents coins. There are 3/5 as many 50cents coins as $1 coins. If the total value of these coins is $23.10, how many coins …
  7. Acc. Algebra 2

    A jar contains 40 coins consisting of dimes and quarters and having a total value of $4.90. How many of each kind if coins are there?
  8. 5th grade math

    I need to use quarters, dimes, nickles and pennies to make the following: $1.53 in 12 coins $2.53 in 20 $2.32 in 15 coins $2.00 in 22 $1.45 in 10 coins $1.76 in 16 coins $0.85 in 11 coins $1.01 in 12 coins $1.29 in 15 coins
  9. Math

    The cash in the school canteen contains x quarters and (30-x) dimes. If the total value of the coins is $5.85, how many of each kind of coins are there?
  10. math

    Grandpa has twenty - four coins in his pocket . grandpa gives Sam some clues the total value of the coins in his pocket one - sixth of coins are quarters , one - half of coins in dimes . what is the total value of the coins in grandpa …

More Similar Questions