Atypesetter retyped 2/5 of a story one day, 3/10 of the story the next day and 4/15 the third day. what fraction of the story did the typesetter do in the three days?

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

i did it myself and i got 4.2 (b) hope its right

step-by-step explanation: