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kathy is 15 years older than dawn. the sum of thier ages is 41. find kathy's and dawn's ages

Sagot :

Let Dawn's age be x
Kathy's age be x + 15
The sum of their ages= 41

x + (x+15) = 41
2x + 15 = 41
2x + 15 - 15 = 41 - 15
2x = 26

2x/2 = 26/2
x = 13

Their ages:
Dawn: x = 13 years old
Kathy x + 15 = (13) + 15 = 28 years old

To check the sum of their ages:
13 + 28 = 41
41 = 41