Question

Johnny has 15 toys with a total value of $125. If some of Johnny's toys are worth $5 and the others are worth $10, how many toys does Johnny have that are worth $5?

Answer 1

5TOYS ARE WORTH 15

10TOYS ARE WORTH 5

Step-by-step explanation:

We have to set up the equation system

we know that both kind of toys total 15 and their monetary value is 225

`x + y = 15 \\ 15x + 5y = 125`

then we clear y in the first equation and replace it in the second equation

`y = 15 - x \\ 15x + 5(15 - x) = 125`

we solve for x in the second:

`15x - 5x = 125 -5 * 15 \\x = 50 / 10 = 5`

Next we solve for y in the first equation

`y = 15 - x= 15 - 5 = 10`