Question
In Vanessa's coin bank there are 4 times as many quarters as nickels, 2 fewer dimes than nickels, and 15 pennies. The total amount in the bank is $5.80. How many of each coin are in the bank?
A. Assign a variable to the unknown quantity.
B. Write an equation you can use to find the unknown quantity.
C. Solve and check the equation you wrote. Show your work.
A. Assign a variable to the unknown quantity.
B. Write an equation you can use to find the unknown quantity.
C. Solve and check the equation you wrote. Show your work.
Answers
Reiny
nickels --- x
quarters -- 4x
dimes ----- x-2
5x + 25(4x) + 10(x-2) + 15 = 580
solve for x, then sub back into my definitions
quarters -- 4x
dimes ----- x-2
5x + 25(4x) + 10(x-2) + 15 = 580
solve for x, then sub back into my definitions
Miranda
Using that equation it comes up to $5.70 not $5.80..?
Reiny
In that case your question is flawed.
since x must come out to a whole number ....
5x + 25(4x) + 10(x-2) + 15 = 580
5x + 100x + 10x - 20 + 15 = 580
115x = 585
x = 5.08...
so there is no solution.
Check your typing
since x must come out to a whole number ....
5x + 25(4x) + 10(x-2) + 15 = 580
5x + 100x + 10x - 20 + 15 = 580
115x = 585
x = 5.08...
so there is no solution.
Check your typing
Miranda
Thanks. Typing is correct .. Question is flawed. Will let teacher know. Appreciate your help!