Question

On Tuesday Shayna bought 7 boxes. On Wednesday half of all the boxes were destroyed. On Thursday there were only 21 left. How many did she have on Monday?

Answer 1

35

Explanation:

Monday=x

Tuesday=7

Wednesday=1/2

Thursday=21

Therefore,

x+7/2=21

=x+7=2*21

=x+7=44

=x=44-7

=x=35