Which of the fallowing is a advantage of using equations

Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.

Awall map has a scale of 128 miles = 6 inches. the distance between springfield and lakeview is 2 feet on the map. what is the actual distance between springfield and lakeview? 384 miles 512 miles 1.13 miles 42.7 miles

At a sale this week, a desk is being sold for $213. this is a 29% discount from the original price. what is the original price?