Question 1167930

A pencil and eraser cost total of 15 naira. What is the cost of 60 erasers. If one pencil cost 5 naira? 
<pre>One pencil costs 5 naira
One pencil and one eraser cost 15 naira
Therefore, cost of one eraser = 15 - 5 = 10 naira
Cost of 60 erasers: {{{highlight_green(matrix(1,4, 60(10), "=", 600, naira))}}}