lexy148 lexy148
  • 08-04-2017
  • Mathematics
contestada

The sum of two numbers is 90. Their difference is 18. Find the numbers.

Respuesta :

irspow
irspow irspow
  • 09-04-2017
a+b=90, let b>a, so b-a=18 

from the first statement b=90-a, using this value of b in the second gives you:

(90-a)-a=18

90-2a=18

-2a=-72

a=36, and since b=90-a

b=90-36=54.  so the numbers are

54 and 36
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