A is 5 years older than B. B is thrice as old as C. Sum of the ages of A, B and C is 40 years. How old is A?

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Q: 37 (SCRA/2012)
A is 5 years older than B. B is thrice as old as C. Sum of the ages of A, B and C is 40 years. How old is A?

question_subject: 

Maths

question_exam: 

SCRA

stats: 

0,2,0,0,0,0,2

keywords: 

{'ages': [0, 0, 3, 2], 'years': [1, 0, 0, 2], 'thrice': [3, 1, 3, 1]}