Question

Carol has only 20p and 10p coins in her purse she has three times as many 20p coins and 10p coins if Carol has ?4.20 altogether, how many 20p coins does she have

Answer 1

I'm not sure how euros work but I'm almost certain there are 18 20p coins

Explanation:

Answer 2

Suppose that Carol has x 10p coins in her purse. Since she has three times as many 20p coins as 10p coins, then she has 3x 20p coins in her purse.

x coins of 10p value $0.10x and 3x coins of 20p value $0.60x.

In total this amount of money is $(0.10x+0.60x)=$0.70x that is exactly $4.20. Thus, you get the equation

0.70x=4.20.

Solve it:

`x=(4.20)/(0.70)=6.`

Carol has 6 coins of 10p and 3·6=18 coins of 20p.