Math
posted by AJ .
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.

5x = 2y therefore
x = 2/5y
x + y = 155
Substitute 2/5y for x in last equation and solve for y. Insert that value into the first equation and solve for x. Check by inserting both values into the last equation.
Respond to this Question
Similar Questions

Math
Susan has some $2coins and $5coins. If there are 18 coins and the total amount of these coins is not less than $75, find the minimum number of $5coins. 
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 … 
Math
200 coins are sorted and kept 3 bags. The first bag has 20 more coins than the second bag. The second bag has twice as many coins as the third bag. How many coins are there in the third bag? 
Math 4th Grade
200 coins are sorted and kept 3 bags. The first bag has 20 more coins than the second bag. The second bag has twice as many coins as the third bag. How many coins are there in the third bag? 
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 
Math
Reasoning In a bag of 24 coins, 5/6 of the coins are pennies. A different bag of 50 coins contains the same number of pennies as the bag of 24 coins. What fraction of the coins in the bag of 50 coins are pennies? 
Maths
A bag contains 8 coins of £1, 7 coins of 50p, 4 coins of 25p and 3 coins of 10p. How many different ways can we take 6 coins from the bag? 
maths
mohan changed 2 in to 5 p 20 p and 50 p coins. if the number of 5 p coins was double the number of 20 p coins and the 50 p coins were one fifth the 20 p coins . how many coins of each denomination did he get? 
math
A collection of coins contains only 10cent and 5cent coins.There are x 5cent coins in the collection. Write an algebraic expression for of following. * The total value of the coins if for every three 10cent coins there are five … 
Math
A bag contains 57 coins, which are only quarters(Q) and dimes (D). The total value of the coins is $9.45. How many times are in the bag?