Practice!

Sample Problem

(1) The mass of the hat and the gloves is oz.

(2) The mass of the hat is oz.

(3) The mass of the gloves is oz.

Solution

(1)   The mass of the hat and the gloves: 20 + 20 = 40 oz.

(2)   The mass of the hat: 10 + 20 = 30 oz.

(3)   The mass of the gloves: 40 - 30 = 10 oz.