Question

A one-ton ice sculpture is melting so that is loses one-fifth of its weight per hour. How much of the sculpture will be left after five hours?

Answer 1

`0.33` ton of the sculpture will be left after `5` hours.

Explanation:

Common ratio is `r= 1-1/5=4/5=0.8`

`1`st term is `a_1=1` ton , number of terms is `n= 5+1=6`

`6` th term is `a_1 * r ^(n-1) = 1* 0.8^(6-1) = 0.8^5= 0.32768`

`0.33(2dp)` ton of the sculpture will be left after `5` hours [Ans]