Lau Guan Yih's answer to Homer's Primary 5 Maths Rate & Ratio Singapore question.
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So we know he bought 2 more caps than shirt.
So we shall start with 3 caps and 1 T shirt.
Right now the price is $30.90 for caps and $12.40 for T shirts and the difference between the two is $18.50 and this is not the difference we are looking for.
To maintain having 2 more caps than shirt, every time we add 1 cap, we have to add 1 shirt.
So 4 caps and 2 T shirt have a difference of $16.40
5 caps and 2 T shirt have a difference of $14.30.
Hence, he bought 5 caps.
Since the numbers are small here, we can use trail and error. There is no need for any complicated methods.
So we shall start with 3 caps and 1 T shirt.
Right now the price is $30.90 for caps and $12.40 for T shirts and the difference between the two is $18.50 and this is not the difference we are looking for.
To maintain having 2 more caps than shirt, every time we add 1 cap, we have to add 1 shirt.
So 4 caps and 2 T shirt have a difference of $16.40
5 caps and 2 T shirt have a difference of $14.30.
Hence, he bought 5 caps.
Since the numbers are small here, we can use trail and error. There is no need for any complicated methods.
Date Posted:
2 years ago
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