Ricardo spent half of his allowance on school supplies. then he bought a snack for $5.25. when he arrived home, he had $22.50 left. which equation and solution represent the amount of ricardo's allowance, a ?

a = 34.5

Step-by-step explanation:

Let's call s, the amount that Ricardo spends on supplies. We know that he spends half his allowance on school supplies so s= 1/2 *a

Next we know he spent 5.25 on a snack and that when he got home he had 22.50 left, so let's include all that information into one equation

So s+5.25=22.50

This can be simplified more because we know that he spends half the total allowance on the school supplies

So 1/2a+5.25=22.50

Now that we have an equation simplify to find a

Subtract 5.25 from both sides:

1/2a = 17.25

Finally, multiply both sides by 2:

a = 34.5

600,000,000,000, or 6e14

step-by-step explanation: