Shannon mary and john earn a weekly allowance shannon earns an amount that is 2/3 of what john earns mary earns an amount that is 1 2/3 of what john earns john earns $20 a week who earns the greatest amount and who earns the least amount

answer: option a.

step-by-step explanation:

you know that the quadrilateral opqr ( a four sided figure) is inscribed in circle. this means that all its vertices are on the circle.

then, by definition, the opposite angles of the quadrilateral are supplementary, this means that the sum of their measures is 180 degrees.

you can observe in the figure that the angles ∠opq   and the angle ∠orq   are opposite, therefore:

then, can be used to d to calculate the measure of ∠opq