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%
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
Again thanks very much with your help on this.
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.
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.
Link added for you.