Question

Carrie has 27 coins in her purse. All the coins are 5 cent or 20 cent
coins. If the total value of the coins is $3.75, how many of each type
does she have?

Answer 1

The working out has to be in algebraic form

Answer 2

start with a lot of 20-cent coins
18x20 + 3x5 = 375
That makes 21 coins. Each 20-cent coin that you replace with four 5-cent coins will add 3 coins to the count.
See where this is going?

Answer 3

Can you please put this in algebraic form? I don't understand how to put it into algebraic form.

Answer 4

Let x = number of 5 cent coins
and y = number of 20 cent coind
----------------------------------
x + y = 27
5x + 20y = 375
---------------------
Solve the two equations simultaneously. If you want to put it in just one equation it will be
5x + 20(27-x) = 375 and solve for x.