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Question
The sum of father's and son's ages is 30 years. If father's age is 28 years, what's the son's age?
The sum of father's and son's ages is 30 years. If father's age is 28 years, what's the son's age?
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Solution
The correct option is B 2 years
Now, let the age of son be x years.
As given, sum of the ages of father and son is 30 years.
Hence the algebraic expression is given as
x+28=30
Using trial and error method,
Case 1:
Putting x = 1,
LHS = 1 + 28 = 29
Hence, LHS is not equal to RHS.
Case 2:
Putting x = 2,
LHS = 2 + 28 = 30
Hence, LHS is equal to RHS.
∴ The age of son is 2 years.
Now, let the age of son be x years.
As given, sum of the ages of father and son is 30 years.
Hence the algebraic expression is given as
x+28=30
Using trial and error method,
Case 1:
Putting x = 1,
LHS = 1 + 28 = 29
Hence, LHS is not equal to RHS.
Case 2:
Putting x = 2,
LHS = 2 + 28 = 30
Hence, LHS is equal to RHS.
∴ The age of son is 2 years.
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