(a) Simplify: 7⅔ + -4⅚ + 2⅜
(b) The area of a trapezium is 31.5 cm2. If the parallel sides are of lengths 7.3 cm and 5.3 cm, calculate the perpendicular distance between them.

(c) The marks scored by four students in a Mathematics test are as follows:
Esi – 92
Seth – 85
Mary – 65
Efe – x
(i) Write down an expression for the mean (average) of the marks.
(ii) If the mean is less than 80, write a linear inequality for the information
(iii) Find the possible marks Efe scored in the test. Represent your answer on the number line.