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Answer:
Keil is 21 years old.
Step-by-step explanation:
N → Neil’s age
K → Keil’s age
- K = N + 6 (Indicates that Neil is 6 years younger than Keil)
- K + N = 36 (Indicates that both their ages add up to 36)
⇒ N + 6 + N = 36 (‘N + 6’ is equivalent to K, as shown is the 1st equation)
2N + 6 = 36
2N = 36 – 6
2N = 30
N = 30 ÷ 2
N = 15 ∴ Neil’s age is 15.
⇒ K + 15 = 36 (’15’ has substituted ‘N’ in the 2nd equation, as Neil is 15)
K = 36 – 15
K = 21 ∴ Keil is 21 years old.