X-2 for x=-3
-3-2=-5, add dem negatives
Answer:

Step-by-step explanation:
Given that the current average property value is two-sevenths more than last year’s average value.
Let x be the last year's average property
Then we have as per the given information this year property value
=
Equate this to

2/5 = 40%
3/10= 30%
1/2= 50%
1/10= 10%
so it's 1/2
100 have smoked at last once