Question

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Answer 1

Answer:

5th question or 6th question clear it

Answer 2

Answer:

Let ROS be x and QOS will be 90+x

And POS be 90-x

Now we will solve the equation 1/2(QOS-POS)

1/2(90+x - 90-x)

1/2(90+x - 90+x)

1/2(2x)

Both the 2 will be removed

=x

Above we considered ROS as x and we here got ROS=x so hence proved