Question

Last year, a repair shop used 1200 small rings. The shop paid 33 1/3 cents per ring for the first shipment and 37.5 cents per ring for the second shipment. If the total cost was $430, how many rings did the second shipment contain? Please show work

Answer 1

f + s = 1,200

(100/3)f + 37.5s = 430

(100/3)(1,200 - s) + 37.5s = 43,000

40,000 - (100/3)s + 37.5s = 43,000

(25/6)s = 3,000

s = 720 rings

The second shipment contained 720 rings.