Question

The temperature of a place is 9degree C. If the temperature drops at the rate of 3 degree C per hour , after how many hours the temperature will become -6degree C.

Answer 1

Answer:

original temp.=9 C°

temp. drop in each hr=3 C°

let the no.of hrs be x,

∴ 9 - x*3 = -6

   9 - 3x = -6

        -3x = -6 - 9

           x = -15/-3=5

∴      x=5

after 5 hrs the temp. will be -6 C

hope this helps:)