Stumped on a simple question

A large jar of marmalade contains 12.5% more than a standard jar. The large jar has 450g in it.
How much does a standard jar hold.

How do I work this out without a calculator ?

Reply 1

Aitch

Put into fractions:

12.5% is 1/8

450 is 9/8 of a standard jar
so 50 is 1/8 of a standard jar
so 400 is 8/8 of a standard jar

Reply 2

jjlang

Thanks

Is that the way you get shown at Standard grade ?

Reply 3

Aitch

jjlang

Thanks

Is that the way you get shown at Standard grade ?

I'm not sure about standard grade!

It's certainly the case that it's often a good idea to be able to convert certain percentages instantly in your head into fractions:

2.5, 5, 10, 12.5, 20, 25.

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