Jin made 24 kites. Each kite had 2 rods and 3 ribbons. How many total rods and ribbons, r, did Jin use for the kites? r =

If one kite has 2 rods and 3 ribbons, then 24 kites have 2 * 24 rods and 3 * 24 ribbons.

2 * 24 = 48

3 * 24 = 72

It means 24 kites has 48 rods and 72 ribbons.

If r is the sum of rods and ribbons, then:

r = 48 + 72

r = 120