A student needs an average of at least 75 marks in three tests. He has scored 68 and 79 in the first two. What is the least he must score in the third?

Find the greatest integer x for which 4x − 7 < 2x + 5.

Solve 5 − 2x ≥ 1 and represent the solution on a number line, x being a real number.

Solve −3 ≤ (3 − 2x)/2 < 3 where x is an integer, and write the solution set.

Solve the inequation (2x − 1)/3 ≤ (x + 2)/2 where x is a real number.

Solve −4 < 2x − 6 ≤ 4 where x is an integer, and write the solution set.

Find the smallest value of x that satisfies 2x + 5 > 3 − x when x is an integer.