Question

answer it .............

Answer 1

=70.5/21
=3.35
........

Answer 2

cost of 21 boxes = $70 \frac{1}{2}$
then

cost of 1 box = $70 \frac{1}{2} \div 21$

= 141/2 ÷ 21
= 141 / 42
= 3.3571