Mr. Rodriguez bought graph paper and rulers for his students. He bought 5 packs of graph paper and 30 rulers for $40. On another trip, he bought 12 packs of graph paper and 20 rulers for $44. What was the price of one ruler?
AAAaannndd the bot gets it wrong yet again!
5x+30y = 4000
12x+20y = 4400
y=100
so a ruler cost $1.00