Question

A student has a stack of 20 identical coins. She correctly determines the height of the stack as 7.7 cm. Calculate the average thickness of one coin. *
Show the working.

Answer 1

Answer:

20 coins = 7.7 cm

By applying unitary method. 20/7.7=2.59cm

the average thickness of one coin=2.59cm

Answer 2

Explanation:

20 coins = 7.7 cm

by apply unitary method:

20÷ 7.7

= 2.59 cm

the avg of thick. one coin

= 2.59 cm