Asked by indira

A rectangular savannah is 30m long by 15m wide. The Ministry of Education wants to fence that savannah using posts and wire. If the posts, costing $18.00 each, are placed 5m apart andt the wire cost $35.00 per metre. Calculate the cost of the posts and wire for fencing that savannah.
Answered by Ms. Sue
Draw a diagram placing the posts. How many posts are needed?

Answered by Ms. Sue
Six posts are on one side. What about the other three sides?

Did you draw a diagram?
Answered by indira
18 posts
Answered by Ms. Sue
Right.

The cost of the posts:
18 * 18 = ?

How much wire is needed?
Answered by indira
15X 35 =525 x2 = 1050

30X 35 = 1050 x 2 = 2100

total cost of wire = $3,150
Answered by Ms. Sue
Where did you get those numbers?

Your answer us right, but impossible to get with your figures.

P = 2L + 2W
P = (2 * 30) + (2 * 15)
P = 90 meters

Cost of wire = 90 * 35
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