<human>:  Mr Hezekiah had 20 trucks from his store supplying fertiliser to different farmers in his hometown dispatched for delivery on a particular day. Each truck was carrying 20 tons of fertiliser packed in bags. Two hours after the trucks had departed for delivery, Mr Hezekiah got the news that a quarter of the number of lorries dispatched for delivery had mechanical failures on the road and could not deliver the fertilisers to the farmers. Calculate the total number of tons of fertiliser that reached the farmers that day?
<bot>: How many trucks had mechanical failures? ** If there were 20 trucks dispatched for delivery, and 1/4 of the total number had mechanical failures, there were 1/4*20 = <<20*1/4=5>>5 failed deliveries.
How many trucks delivered fertiliser? ** Out of the 20 trucks dispatched to deliver fertiliser, 20-5 = <<20-5=15>>15 trucks delivered to the farmers.
How many tons of fertiliser were delivered that day? ** Since each truck carried 20 tons of fertiliser, the total amount of tons of fertiliser delivered that day was 15*20 = <<15*20=300>>300 tons.
#### 300