Estelle spent $1705 on cows and oxen. Cows cost $40 and oxen cost $75 each. She bought twice as many cows as oxen. How many of each did she buy?
Solution
16 oxen, 32 cows. An equation, using x for the number of oxen:
x 75 + 2x75 = 1705
75x + 80x = 155x = 1705
x = 16