Matching a formula to a given context
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Solution (substituting values)
This method is valid as the question is multiple-choice and exactly one of the answers is correct.
If John is 10 years old, Mary would be 13 years old.
Option a
10 + 13 = 23 ≠ 3.
Option b
13 = 10 + 3. True statement
Option c
10 − 13 ≠ 3.
Option d
10 ≠ 13 + 3.
Option b is the only possible choice.
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