We have a question: A desert garden’s sprinkler system runs twice a day during the cool morning and evening hours. It waters the garden with four liters of water in the morning and six liters in the evening. How many days does it take the sprinkler system to use 50 liters of water?
And an answer: 5
So how you got the answer?
Every day, the sprinkler uses 4 + 6 = 10 liters of water. Hence, it takes the sprinkler system 50 / 10 = 5 days to use 50 liters of water.

We have a question: On a particular day, a car traveled from Ningi to Zipra in 80% of the time it traveled from Ngapara to Zipra. If the car took 60 hours to travel from Ngapara to Zipra, calculate the total time the car traveled that day.
And an answer: 108
So how you got the answer?
If the car traveled from Ningi to Zipra in 80% of the time it traveled from Ngapara to Zipra, it took 80 / 100 * 60 = 48 hours to travel from Ningi to Zipra. The total travel time that day is 48 + 60 = 108 hours.

We have a question: James buys $3000 worth of stuff from Amazon. He has to return a TV that cost $700 and a bike that cost $500. He also sells another bike that cost 20% more than the bike he returned for 80% of what he bought it for. He then buys a toaster for $100. How much is he out of pocket for everything?
And an answer: 2020
So how you got the answer?
The items he returned were valued at $700 + $500 = $1200. So far he is out 3000 - 1200 = 1800 after recouping 1200. An item that is 20% more expensive cost 1 + .2 = 1.2 times as much as the item. So that means the bike he sold cost $500 * 1.2 = $600. He sold it for $600 * .8 = $480. From the bike that he had bought for 600, he was out 600 - 480 = 120. So far he is out 1800 + 120 = 1920. If he also bought a toaster worth 100, he was out 1920 + 100 = 2020.