Temperature decreases approximately 1degree Celsius for each 150 metres increase in altitude.

1. The temp at sea level is 25 degree Celsius
A.) what will the temp be 1200m up the mountain?
B.) what will it be at the top? (2250m)

2. The temp at the top of the mountain is 0degrees celciius.
A.) what will the temp be at 1200m and at 2250 m

This is so confusing to me, please help!