Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

You are not logged in.

#1 Re: Help Me ! » Problem re Area of a square inside a circle, inside a square? » 2013-03-17 10:18:20

Hi Bob,

Just wanted to let you know that I passed my Royal Marines Recruit test with such a high score that I can apply to join as an officer.

Thank you for all your help,

Bourne

#2 Re: Help Me ! » Problem re Area of a square inside a circle, inside a square? » 2013-01-29 08:09:11

Hi Bob,

Thanks very much for your help. I might have a few other questions for you. I'm glad you enjoyed helping me out.

Will post them here when they most likely pop up.

Cheers!

#3 Re: Help Me ! » Problem re Area of a square inside a circle, inside a square? » 2013-01-29 02:19:33

Hi Bob,

Thanks for the help. I've so far got the following;

18. Percentage wastage of steel = 70 x 62.5

= 4375 cm squared.

Then minus the area of the remaining shape = 4375 - 1926

= 2449cm squared

Then 2449 / 4375 x 100%

= 55.9

= 56%

19. Length of coil = 25m or 2500cm

= 2500 x 70

= 175000 cm squared

Number of Units = Area of coil/ Area to make one component

= 175000 / 4375

= 40 Components.

I'm having some trouble with what you said for question 20, If $200 is required for a 25m Length where is the 200 - 200 coming from and the 0.5(Is that the 50% of the cost part)? The answer I'm currently getting is not what it should be.

Cost of individual component = 200 - 200 x 56/100 x 0.5 (Divided by Ans to Q19)

= 200 - 11200/100 x 0.5

= 200 - 112 x 0.5

= 200 - 56

= 144 / 40

= $3.6

Again thanks very much with your help on this.

#4 Re: Help Me ! » Problem re Area of a square inside a circle, inside a square? » 2013-01-28 08:29:25

Hi Bob,

Thanks very much for your help.

For question 17 I used:

Area of a circle = Pi x r squared

= 3.14 x (30 x 30)

= 3.14 x 900

= 2826cm squared.

Then minus the area of the square

= L x B

=30 x 30

= 900cm squared

So 2826 - 900 = 1926cm squared?

The diagram makes sense to me, I never thought about drawing it like that with the information given.

#5 Help Me ! » Problem re Area of a square inside a circle, inside a square? » 2013-01-27 20:42:40

Bourne88
Replies: 9

Hi there,

I am really struggling with the following questions regarding working out the area and percentages with the following questions 17 - 20. The site has been extremely useful for practicing for my recruit test for the Royal Marines but I constantly get stuck on these type of questions and cant work out how to complete them. Because I'm a new member I cannot post a direct link to the paper.

But if you google - 'Psychometric success mechanical comprehension Practice test 1' a link to the paper will come up.

I get the right answer for question 17 but have no idea where to start for 18-20.

If anyone could aid me with working out or point me in the right direction I would be extremely grateful.

http://www.psychometric-success.com/pra … st%201.pdf

Link added for you.

Thank you

Board footer

Powered by FluxBB