Question

A block of ice loses one third of its weight every hour. After one hour, the block weighs 60 pounds. How much did the block weigh to begin with

Answer 1

90?

Answer 2

an hour before it was 40 it was 60
an hour before that it was 90

so it started at 90, it lost a third so then was 60
from 60 it lost another third, so became 40

started at 90 pounds