Question

Ankur appeared in an examination which has 5 subjects, out of five, in four subjects he got $90, 70, 75, 65$ marks respectively. The minimum & maximum marks he should score in fifth subject so that the average mark is greater than or equal to 70 and less than or equal to 75 is

• A. $55, 75$
• B. $55, 70$
• C. $50, 75$
• D. $50, 70$

Answer 1

Answer: (C)

$50, 75$

Answer 2

Let Ankur got $??? So, average marks$=\frac{90+70+75+65+x}{5}$Given$70 \le \frac{90+70+75+65+x}{5} \le75$$350 \le300+x\le375$$50 \le x\le75$