The average age of a, b, c, d and e is 40 years. the average age of a and b is 35 years and the
average age of c and d is 42 years. the age of e (in years) is:
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[Equation 1]
a + b + c + d + e = 40
where,
a + b = 35
c + d = 42
substituting the values of [Equation 1], we get:
a + b + c + d + e = 40
⇒ 35/2 + 42/2 + e = 40
⇒ 17.5 + 21 + e = 40
⇒ 38.5 + e = 40
⇒ e = 40 - 38.5
⇒ e = 1.5 years old
a + b + c + d + e = 40
where,
a + b = 35
c + d = 42
substituting the values of [Equation 1], we get:
a + b + c + d + e = 40
⇒ 35/2 + 42/2 + e = 40
⇒ 17.5 + 21 + e = 40
⇒ 38.5 + e = 40
⇒ e = 40 - 38.5
⇒ e = 1.5 years old
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