A town throws away 2400 kg of waste each day, and 55 % of it is biodegradable…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A town throws away kg of waste each day, and % of it is biodegradable. How many kilograms a day are non-biodegradable? How many tonnes is that in days?
Need a reminder? The key ideaShow
Biodegradable substances are broken down by decomposers, whose enzymes act only on certain substances; non-biodegradable ones, such as plastics, glass and metal cans, last for a very long time. They block drains, harm animals and can build up in food chains.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. A day. kg.
Step 2. Thirty days. kg, which is tonnes.
Answer: kg a day, tonnes in days.
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