Question 935505
Let the two numbers be a and b respectively
    From the 1st sentence
       a+b = 100.......(1)
    From the 2nd sentence
       a = 4(b)
       a = 4b
       a-4b = 0...........(2)
 Eliminate equation (2) from equation (1)
     5b = 100
      b = 100/5
      b = 20
 Substitute b = 20 in equation (2)
   a-4b = 0
   a-4(20) = 0
   a-80 = 0
   a = 80
Since a and b represented the two numbers
Therefore the numbers are 80 and 20