Let x be the age of Sendo.
x = Sendo's age
x + 4 = Aning's age
Linear Equation:
2 (x-3) = (x + 4) + 9
2x -6 = x + 9
2x = x + 9 + 6
2x = x + 15
2x - x = 15
x = 15
x = 15 = Sendong's age
x + 4 = 15 + 4 = 19 = Aning's age
Check:
2(x-3) = x + 9
2 (15 - 3) = 15 + 9
2(12) = 24
24 = 24, Correct!!!
Answer:
Sendong's age is 15 years old and Aning's age is 19 years old.
Check:
1.) Aning's age is 4 years older than Sendong's: 15 and 19 ( is 19 four more than 15? Yes, check it.
2.) Is Aning's age after 5 years is twice Sendong's age 3 years ago?
19 + 5 = 15 - 3
24 = 12 ( Correct! It is twice Sendong's age!!! Check!!!