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Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion


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July 28th, 2019, 07:36 AM   #1
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Why second initial value taken as 10 instead of 100?

Rohan purchased a bike for Rs 54000. He sold it at a loss of 8%. With
that money he again purchased another bike and sold it at a profit of10%.
what is his overall loss/ profit?

Sol:


1000 = 54000
1 = 54.
12 = 12*54 = 648

Why second initial value taken as 10 instead of 100?
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July 28th, 2019, 11:40 AM   #2
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Quote:
Originally Posted by Ganesh Ujwal View Post
1000 = 54000
1 = 54.
12 = 12*54 = 648

Why second initial value taken as 10 instead of 100?
I'm going to leave this for someone else to explain but all three of these statement are garbage. For example 1000 = 54000. These numbers are not equal!

-Dan
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July 28th, 2019, 11:38 PM   #3
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I hate these stupid shortcuts, unless you know exactly how they work, and can remember them, one mistake and you have no hope of finding where you went wrong. Learn to do the maths properly, it's a lot less to remember!
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July 29th, 2019, 03:44 AM   #4
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Originally Posted by weirddave View Post
I hate these stupid shortcuts, unless you know exactly how they work, and can remember them, one mistake and you have no hope of finding where you went wrong. Learn to do the maths properly, it's a lot less to remember!
In Indian maths, shortcut & final answer matters. how they work doesn't matter.
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July 29th, 2019, 05:16 AM   #5
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Originally Posted by Ganesh Ujwal View Post
In Indian maths, shortcut & final answer matters. how they work doesn't matter.
Well that's one way to weed out all the non-mathematicians.
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July 29th, 2019, 11:28 PM   #6
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How they work absolutely matters if you want to be able to use them, which is why you're here isn't it?

Quote:
Originally Posted by Ganesh Ujwal View Post
Why second initial value taken as 10 instead of 100?
If you knew how the shortcut worked you'd be able to do it.

But, that isn't what I was trying to say. If you can do the actual maths then all of these problems become much easier as you don't need to remember how to use any of the shortcuts, you simply don't use them! It also means you can do maths problems that you don't know the shortcut for.
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