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what do you mean by $$ and frac ,when solving the questions

indian history

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I need questions in hindi language

7,35,210,___,6300,31500 ???

lf a man walks 3/5th of his original speed and gets 12 minutes late. What is his usual speed?

In this question since distance is constant, speed and time will be inversely proportional. So if speed decrease by 2/5 then the time increases by 2/5. Hence 2/5*T=12
T=12*5/2=30 minutes
what is wrong with this approach?

If I have to measure 1 to 5 weights using a beam balance, what is the minimum number of weights required?

Using the formula mentioned in the video concepts, I am getting the answer as 2.

But unable to get 5 using 2 weights of 3

Please help.

I have a doubt about profit and loss daily test 20 question 3? Please help.

I want notes of gs....

what is elementary mathematics?