A cold virus spreads in a hostel. 40 of the students are poorly nourished, and 60% of them fall ill…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A cold virus spreads in a hostel. of the students are poorly nourished, and of them fall ill. are well nourished, and of them fall ill. How many students fall ill in each group, and how many in all?
Need a reminder? The key ideaShow
Most diseases have an immediate cause, usually a microbe, and contributory causes such as poor nutrition, unclean surroundings, crowded homes, harmful habits and inherited traits. Infectious diseases are caused by microbes and can spread; non-infectious diseases such as cancer and high blood pressure have internal causes.
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. Poorly nourished. students.
Step 2. Well nourished. students.
Step 3. In all. students.
Answer: and , which is students in all. The share who fall ill is higher among the poorly nourished.
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