# CalculationWatch

Thread starter 2 months ago
#1
How do i work out question 1, part c?
https://pmt.physicsandmathstutor.com...%20A-level.pdf

Mark scheme:
https://pmt.physicsandmathstutor.com...%20A-level.pdf
0
reply
2 months ago
#2
Hi Chelsea - let me take you through this step by step (keep a tissue handy as babies cry sometimes [you might have heard or seen this on telly OR in your mirror - sorrrrrrrrry! ]

You know that population increases by 9.3 per 1000
AND
decreases by 9.7 per 1000

So how much does it decrease by net??? ---------------------xxxxxxxxxxxxxxxxxxxx-------------------------xxxxxxxxxxxxxx
YES well done, of course by 0.4/1000 - even a millenial does not require a calculator for this baby stuff!!

If out of 1000 people, 0.4 are reduced, then out of the actual population (60,200,000) how many will be reduced?

YES YOU SAID IT - good the answer is:
....…………………...
………………….
…………..
…...
"Easy peasy lemon squeezy, yeah?

(60,200,000/1000) X 0.4

= 60,200 X 0.4 (cancel out 3 zeros in numerator AND denominator, OK?)
= 24080

Yes, but Q asks NOT how many reduced BUT size of p-ln

So, Well I think you can do a simple subtraction - again try it in your mind instead of reaching for your calculator as woosy teachers teach you to.

Happy now - if you get it right, you can throw away the tissue and ask mum for some Smarties! (yummy! - enjoy!)

M
0
reply
X

Write a reply...
Reply
new posts
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### University open days

• Bournemouth University
Clearing Open Day Undergraduate
Wed, 31 Jul '19
• Staffordshire University
Postgraduate open event - Stoke-on-Trent campus Postgraduate
Wed, 7 Aug '19
• University of Derby
Foundation Open Event Further education
Wed, 7 Aug '19

### Poll

Join the discussion

Yes (135)
60.81%
No (87)
39.19%

View All
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.