Answer:
3.5 Inches of snow left on Friday Night
Step-by-step explanation:
On Monday there was no snow
On Tuesday there was 3 inches
On Wednesday 3 - 0.5 inches= 2.5 inches of snow
On Thursday 2.5 + 2.5 inches= 5 inches
On Friday 5 - 1.5 inches=3.5 inches
Therefore the answer is that the was 3.5 inches of snow Friday night
So... hmmm if you check the first picture below, for 2)
we could use the proportions of those small, medium and large similar triangles like

now.. for 3) will be the second picture below
First answer is the correct answer