72-(-11) = 83
72/3 = 24, so the building is 24 stories high
Mary climbs 21 or 22 of those, depending on whether you count the ground floor as story zero.
John starts out in the basement parking garage, 11m below street level. He climbs all the steps to the roof of the building and is now 72m above street level. how many metres has he climbed? Mary join John at the third strey.Each story is 3m high. She accompanies Johnto the roof. How many metres does she climb.
1 answer