1.

Express the following numbers in the form of p :q (a) -25.6875(b) 0.621621621..(c) 15.71212121​

Answer»

(C) 15.7 121212.......=x

Then 100x=1571.212121.........

{why should we MULTIPLY with 100 only?

Ans:-because TWO numbers (i.e.,1,2)are REPEATING}

Now let

X=15.7121212.......be equation 1

100x=1571.212121.......be equation 2

Subtract equation 1 from equation 2

100x=1571.21212121.....

- x=15.7121212......

-------------------------------

99x=1555.5

{212121.....will cancel from both the equations}

X=1555.5/99

X=15555/990



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