roberto4589 roberto4589
  • 06-06-2017
  • Mathematics
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Bill is thinking of 2 numbers. They have a sum of 28 and a difference of 8. What are the 2 numbers?

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Aishani
Aishani Aishani
  • 06-06-2017
Let the two numbers be a and b respectively.
a + b = 28 ----1.
a - b = 8 ----2.
Solve those equations simultaneously.

1.-2.
a - a + b - - b = 28 - 8
2b = 20
b = 10

Replace b in equation 1 or 2
a + b = 28
a + 10 = 28
a = (28 - 10) = 18

sum = 10+18 = 28
difference = 18-10 = 8

Hope it helped!
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