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primary 5 | Maths
| Fractions

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Pls help me to understand why the answer is 3 instead of 2.thank you

(NOT the same as she bought 3/4 kg of sugar and used 1/5 kg)

1/5 of the 3/4 kg

= 1/5 x 3/4

= 3/20

Mass left

= 3/4 - 3/20

= 15/20 - 3/2

= 12/20

= 3/5

She bought 3/4 kg sugar and used 1/5 kg of sugar

Then the mass left

= 3/4 - 1/5

= 15/20 - 4/20

= 11/20

The phrase “1/5 of it” versus “1/5 kg” are completely different.

Can you Pls explain more .thank you

This means that we split the 3/4 kg into 5 equal parts. If we express 3/4 kg as 15/20 kg, we can split this into 5 equal parts of 3/20 kg each.

This is different from the other case in which you are just subtracting kg against another kg.

“1/5 of it” and “1/5 kg of it”.

These are not the same.

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