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Question

Express 0.4¯7 in the form pq, where p and q are integers and q0.

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Solution

0.4¯7= 0.4777...

=410+0.77710

Let x = 0.777…

10x = 7.777… [Since only one digit is repeating, multiply x with 10.]
10x = 7+ 0.777...
10x = 7 + x
x=79
Therefore,
0.4¯7=410+x10=410+790=36+790=4390


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