Question

There are 300 coins of the same type in two stacks. One stack is 380 millimeters tall. The other is 220 millimeters tall. Find the thickness of one coin

Answer 1

Total coins = 300

Total thickness of the two stacks is
380 + 220 = 600mm

The thickness of a coin is
(600 mm)/(300 coins) = 2  mm per coin.

Answer: 2 millimeters