John spent $1705 on cows and oxen. Cows cost $40 and oxen cost $75 each. He bought twice as many cows as oxen. How many of each did he buy?
Let x be the number of oxen purchased.
Then 75x + 40(2x) = 1705; 75x + 80x = 1705; x = 11.
So 11 oxen, 22 cows.
Check: 11(75) + 22(40) = 825 + 880 = 1705.