Solution
The ratio of the number of words spelt correctly to
that of words spelt wrongly is 3 : 1. I
use triangle to surround the ratio units.
Multiplying by 10 and 4 respectively, we obtain 30 and 4 units
respectively. The score accrued is 30 –
4 = 26 units which corresponds to 130.
Dividing by 26, we get 1 triangle unit corresponding to 5. And that is the answer required because it 1
triangle unit represents the number of words spelt wrongly.Ans: 5
Reflection
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