The marks obtained by Sukriti in first two unit tests are 75 and 70. What is the number of minimum marks she should get in the third unit test to have an average of atleast 60 marks?

35

The correct answer is option (2) : 35 marks

Let x be the marks obtained by Sukriti in 3rd unit, then

$\frac{75+70+x}{3}≥60$

$145+x≥180$

$x≥35$

Hence, Sukriti should obtain a minimum of 35 marks