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Hi Chun Li,
Here is my solution, hopefully you are able to understand it.
Given that there is 300 mollies, and 30% (3/10) are red, we can safely say that there are 90 mollies that are red.
300 / 10 x 3 = 90
Remainder mollies whoch is 300-90 = 210.
I found the number of black mollies using the fraction given and hence the percentage.
For part b), it is to use the same method to find the number of orange mollies using the fraction (2/5) derived.
(This is as 3/5 of the remaining are black, the other 2/5 will be orange.)
Hope this helps! :)
Here is my solution, hopefully you are able to understand it.
Given that there is 300 mollies, and 30% (3/10) are red, we can safely say that there are 90 mollies that are red.
300 / 10 x 3 = 90
Remainder mollies whoch is 300-90 = 210.
I found the number of black mollies using the fraction given and hence the percentage.
For part b), it is to use the same method to find the number of orange mollies using the fraction (2/5) derived.
(This is as 3/5 of the remaining are black, the other 2/5 will be orange.)
Hope this helps! :)
Date Posted:
7 years ago
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Or a faster method is:
since you have found out that there are 42% of black mollies, and given that 30% are red, subtract from 100% to find the % of orange mollies, and convert to the number using the total of 300 mollies given.
Didnt realise this until i re read the question!
Hope this helps :)
since you have found out that there are 42% of black mollies, and given that 30% are red, subtract from 100% to find the % of orange mollies, and convert to the number using the total of 300 mollies given.
Didnt realise this until i re read the question!
Hope this helps :)
Date Posted:
7 years ago