Monday

March 30, 2015

March 30, 2015

Posted by **Nicole** on Sunday, October 2, 2011 at 12:17am.

- Math -
**hurrdurrbeedooda**, Sunday, October 2, 2011 at 12:54amLet x = 2$ coins

Let y = 5$ coins

First equation is for the total amount of coins:

x + y = 18

Second Equation is for total amount in dollars in total from the coins:

2x + 5y = $75

Lets isolate for y

x = 18 - y

Sub into second equation

2(18 - y) + 5y = 75

36 - 2y + 5y = 75

3y = 39

y = 13

Therefore, you must have at least 13 $5 coins.

**Answer this Question**

**Related Questions**

5th grade math - I need to use quarters, dimes, nickles and pennies to make the ...

maths - A bag contained a number of 20cents, 50cents and $1 coins. 1/3 of the ...

math - Sasa had some 20-cent and 50-cent coins. 7/8 of the coins were 20-cent ...

math - jeremy has 19 coins of 2 different values. the total value of coins is 1...

Math - A bag contains forty coins, all of them either 2c or 5c coins. Let there ...

Maths - A bag contains 8 coins of £1, 7 coins of 50p, 4 coins of 25p and 3 coins...

Math - Mrs. Chans math class contributed 2 dollars and $1 coins to an earthquake...

maths - Andrew has 7 20c coins and 5 50c coins in his piggy bank. What is the ...

Math - Reasoning In a bag of 24 coins, 5/6 of the coins are pennies. A different...

math - you have16 coins that are heads up an18 coins that are tails up. After ...