Answer:
20 tins
Explanation:
divide the shape (like in diagram) into 3 trapezia.
Area of trapezium = ½ X (sum of parallel sides) X distance between them.
area of bottom trapezium = 1/2 X (6 + 16) X (14 - 10)
= 1/2 X 22 X 4
= 44.
area of top left trapezium = 1/2 X (10/2 + 16/2) X 10
= 1/2 X (5 + 8) X 10
= 1/2 X 13 X 10
= 65
area of top right trapezium = area of top left trapezium = 65.
total area = 44 + 65 + 65 = 174ft².
we need 174/9
= 19.33333 tins.
that is, we need 20 tins