Find the value of ifstand for 21 and stand for 19. [iOM ‘16]

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Find the value of<br><img src='https://www.fatskills.com/images3/class4olympiad/image01625.jpeg' alt='' width='400px'> if<br><img src='https://www.fatskills.com/images3/class4olympiad/image01626.jpeg' alt='' width='400px'>stand for 21 and<br><img src='https://www.fatskills.com/images3/class4olympiad/image01627.jpeg' alt='' width='400px'> stand for 19. [iOM ‘16]