Elevation of a place in negative meters

Question

Need to see this problem worked out longways  If a quarry has an elevation of about -20 meters,  and a basin is about 4.3 times as far below sea level, what steps do I use to find the elevation of the basin in meters?

Answer 1

I hope I understand the problem correctly...

 

If the quarry's elevation is -20 meters, then that means it is 20 meters BELOW sea level.

 

The basin is 4.3 time as far below sea level as the quarry is, so that's 4.3 * 20 meters = 86 meters.  Expressing this as an elevation (where negative means below sea level), the basin's elevation would be -86 meters.