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primary 6 | Maths | Data Analysis
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Jeff
Jeff

primary 6 chevron_right Maths chevron_right Data analysis chevron_right Singapore

Hi pls assist, thanks!

Date Posted: 5 years ago
Views: 364
Eric Nicholas K
Eric Nicholas K
5 years ago
He has six more 50c coins than 20c coins

And all the money is $24 (2400c).

The extra six more 50c coins translates to an extra $3.

Remove the six coins and you have an equal number of 50c and 20c coins which has a total value of $21.
Jeff
Jeff
5 years ago
Thanks, this is the step that I am stuck.
Eric Nicholas K
Eric Nicholas K
5 years ago
Pretend that one 50c coin and one 20c coin is now one ‘70c’ coin (two coins become one).

Since the total value of all the ‘70c’ coins is $21 (2100c), there must have been 2100/70 = 30 of such ‘70c’ coins.

This means that the $21 consists of 30 of the 50c coins and 30 of the 20c coins. At the start there were 36 of the 50c coins and 30 of the 20c coins.
Eric Nicholas K
Eric Nicholas K
5 years ago
There must have been 66 coins altogether.

I can’t send all the working in one post because on some occasions the screen does not allow my to type beyond a certain length.
Jeff
Jeff
5 years ago
Oh I got it now, all thanks to your detailed explanation! Thank you!
Jeff
Jeff
5 years ago
Thanks Eric! Appreciate it!

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TJHK
Tjhk's answer
53 answers (A Helpful Person)
1st
Jeff
Jeff
5 years ago
Thanks!
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AC Lim
Ac Lim's answer
13073 answers (A Helpful Person)
Hope this help
Jeff
Jeff
5 years ago
Thanks AC!
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Nuzzrath Hazzeena
Nuzzrath Hazzeena's answer
6 answers (Tutor Details)
Jeff
Jeff
5 years ago
Thanks!