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EXAMPLE:
Sarah has 80 pieces of picture cards of vertebrates. The pie chart shows the classification of vertebrates.
 SOLUTION:
a) What is the percentage of amphibians?
Percentage of amphibians:
100% - (25% + 20% + 15% + 35%)
= 100% - 95%
= 5%
b) Find the difference between the number of mammals and bird picture cards.
\(\text{ Mammals} = \dfrac{25}{100}\times 80\text{ pieces}\\ \quad\quad\quad\space\space\space\space\space\space\space=20\text{ pieces}\)
\(\text{ Bird}= \dfrac{35}{100} \times 80\text{ pieces}\\ \quad\space\space\space\space\space\space = 28\text{ pieces}\)
The difference between the number of the picture cards of mammals and birds:
Mammal picture cards - Birds picture cards
= 28 pieces - 20 pieces
= 8 pieces
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