Subtraction of two nearly equal quantites destroy the accuracy. Comment.

Explanation

This is true. For example when x = 20.86 and y
= 20.84, x - y = 20.86 - 20.84 = 0.02 has only
one siginificant figures each. Hence, it is
advisable to measure directly the difference
between two nearly equal quantites instead of
measuring the quantites and calculating their
difference.