51 छात्रों की एक कक्षा में नयना का स्थान ऊपर से 21वां है। नीचे से उसका स्थान क्या होगा?

Kartik ranked 19th from the top and 54th from the bottom in his class. How many students are there in his class?

Mr. Hepa ranked 22nd from the bottom and 57th from the top in his class. How many students are there in his class?