Search me.
Search me.
Let the cost of the ball be x
Therefore the bat costs x+1 (working in £)
We know: cost of bat + cost of ball = 1.10
Substitute the costs we know:
x+1 + x = 1.10
So: 2x+1 = 1.10
So: 2x=0.10
So: x=0.05
Therefore cost of ball is 5 pence
Cost of bat is £1.05
You can't buy 2 metres; you have to buy 2.1m. Timber is sold by the "metric foot"
Suppose the angle grinder as a diameter of x inches
The circumference is about 3x (taking Pi as 3)
3000 rpm = 180000 r/hrTherefore a point on the circumference travels 3x X 180000 = 5400000x inches in an hour.
With 5280 ft to the mile, call it 5400 (It just an estimate we need.
540000x/5400 miles per hour.Or 100x.
So, multiple the diameter by 100 to get an estimate of the edge speed.
On that basis either the grind is small or he made an error.
He didn't, you did. You've mixed your inches and feet.
And other people have mentioned the speed is 11,000 RPM and diameter about 110mm. (4.5" angle grinder).
Oh, the irony - given the direction the thread's taken...
There are stones which are not 14 pounds.
Aha, Wiki manages a little table with the 15 pound wool stone - and others:
Commodity Number of Pounds Wool 14, 15, 24 Wax 12 Sugar and spice 8 Beef and mutton 8
My understanding of a guinea was it was was 21 shillings and used to pay auctioneers and other such persons as it included a 5% commission above the value of a "pound" for the auction house.. Perhaps I got that trinket of wisdom from Bargain Hunt or Flogit or whatever who knows...
Ah, a fellow enthusiast. I dream about "kindling my desires with Mrs S under her tiger-skin duvet" :-)
So I did.
Either way the point was the method, ie no need to do much real mental maths.
Unless you're Dyslexic :)
I'm sorry, but that is the WRONG answer. You were only asked to work out the cost of the ball, NOT the bat as well. ;->
If that's bad, try buying a tyre... width in mm, height as a percentage of width, and wheel diameter in inches.
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