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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

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!

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.

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.

**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

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