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M.D. Holloway 04-05-2017 05:18 PM
Fun Math Questions
 
A bat and ball cost $1.10.
The bat costs one dollar more then the ball.
How much does the ball cost?

If you answer, show the proof and post another fun math question. SmileWavy

dad911 04-05-2017 05:31 PM
bat+ball=1.10
bat = ball+1

(ball+1)+ball = 1.10
ball+ball=.1
ball = .05, so Bat = 1.05

******
What is the value of 6 × 4 - 12 ÷ 3 - 8 ?

LakeCleElum 04-05-2017 06:03 PM
If you took all the Pickles eaten in the country each year, and laid them end to end:

People would think you were crazy.

winders 04-06-2017 01:53 AM
Quote:
Originally Posted by dad911 (Post 9539985)
what is the value of 6 × 4 - 12 ÷ 3 - 8 ?
6 × 4 - 12 ÷ 3 - 8 = ?
(6 × 4) - (12 ÷ 3) - 8 = ?
24 - 4 - 8 = 12


Arrange four 7's and, using no more than two math symbols, make the total be 100.

M.D. Holloway 04-06-2017 11:49 AM
math symbols as in functions only?

JD159 04-06-2017 11:59 AM
Should bust out my GMAT book. Some of those math questions were tricky. Well, for me anyway! I'm not an engineer like most of you!

Seahawk 04-06-2017 12:16 PM
The bat costs $1.05 and the ball costs $0.05:
1.05 + 0.05 = 1.10

This question was in the 31st October issue of the New Scientist magazine on page 38. There were also two other questions printed with it:

If it takes 5 machines 5 minutes to make 5 widgets, how long would it take 100 machines to make 100 widgets?

In a lake, there is a patch of lily pads. Every day the patch doubles in size. If it takes 48 days for the patch to cover the entire lake, how long would it take for the patch to cover half of it?

Paul T 04-06-2017 12:36 PM
Quote:
Originally Posted by Seahawk (Post 9540889)
If it takes 5 machines 5 minutes to make 5 widgets, how long would it take 100 machines to make 100 widgets? [/I]
5 mins - each machine makes 1/5 widget per minute
100*.2*5=100

sammyg2 04-06-2017 12:53 PM
Quote:
Originally Posted by Seahawk (Post 9540889)
In a lake, there is a patch of lily pads. Every day the patch doubles in size. If it takes 48 days for the patch to cover the entire lake, how long would it take for the patch to cover half of it? [/I]
Show my work?

<iframe width="560" height="315" src="https://www.youtube.com/embed/jQJ6Bs-lAPI" frameborder="0" allowfullscreen></iframe>








(no, that ain't me).

winders 04-06-2017 02:50 PM
Quote:
Originally Posted by winders (Post 9540213)
Arrange four 7's and, using no more than two math symbols, make the total be 100.
Quote:
Originally Posted by M.D. Holloway (Post 9540865)
math symbols as in functions only?
Any math symbol: + - / = . ^, etc.

MikeSid 04-06-2017 03:03 PM
Quote:
Originally Posted by M.D. Holloway (Post 9540865)
math symbols as in functions only?
A decimal point is not a math symbol apparently.

This problem can be presented with any 4 identical numbers. The same method will result in 100 regardless of the number selected for the problem.

winders 04-06-2017 07:47 PM
Quote:
Originally Posted by MikeSid (Post 9541099)
A decimal point is not a math symbol apparently.
Of course it is....

Otter74 04-07-2017 04:13 AM
Quote:
Originally Posted by winders (Post 9540213)
Arrange four 7's and, using no more than two math symbols, make the total be 100.
77 / .77 = 100

Sorry, I don't have a good challenge to follow up with. Maybe this: what's a technique for quickly finding the squares of large two-digit numbers (technique transferable to larger numbers, too) in your head.


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