National Education > Selective Schools Admissions Tests

I need some help for the selective test!!!!

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Novashock:

--- Quote from: Hannibal on June 12, 2014, 10:06:00 pm ---Hey Nova,
Please don't cram before the exam, it will stress you out more than anything. Maybe just read over a few notes, to get you in the mood :).

--- End quote ---

--- Quote from: Shinkaze on June 12, 2014, 10:04:05 pm ---It is 5% from your school get into the selective schools so including MHS, Suzanne Cory, Mac.Rob and Nossal :)

--- End quote ---
Thanks, Will do ;D Now I better get some sleep, I have two big days in front of me.

Novashock:
Hay guys, just wanted to know how to solve a question like this-
Concrete is made by mixing screenings cement and sand in the ratio 3:1:15. How much sand would be needed to make 125 tonnes? How do I know how much the ratio makes, and how do I solve these types of questions? Please help!!

Eyes-_-:
hey NovaShock,
For ratios this is how I do it( not sure if its the right way or whatever )
3:1:15, you add these together then divide the answer into the total amount eg.
125 divided by 19 (125/19). Then when you get the quotient  ( for this it is a really long one 6.57... )
you use the quotient and multiply it by the parts if you want to find the 3 part (screening) it will be 6.57... * 3 or whatever it asks for.

sparked:
Hey Novashock haha firstly just take a breath!

For every 15 parts of sand there are 3 parts of cement and 1 part of screenings.

Therefore, if sand makes up 15 parts of 19, then 15/19 = %78.9473 of the total mixture.

.789473*125 tonnes = ~ 98.68 tonnes of sand.

Novashock:
Thx

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