Shoes cost $20 a pair and boots cost $60 a pair. Arlene and Jerry spent $8000 and bought 3 times as many boots as shoes. How many pairs of each did they buy?​

They bought 40 shoes and 120 boots.

Step-by-step explanation:

So from the question itself we can make the following equation.

Let "x" be the number of shoes they bought, then...

20(x) + 60(3x) = 8000

20x + 180x = 8000

200x = 8000

x = 8000 / 200

x = 40

From here we know that..

# of shoes they bought = x = 40

# of boots they bough = 3x = (3)(40) = 120