Lily has a bag of 140 marbles the bag has an equal number of green and blue marbles and an equal number of red and yellow marbles if lily arranged all the green marbles in groups of 8 and all of the blue marbles in groups of 7 how many red marbles are in the bag

If there are equal amounts of blue and green marbles, then there are 56 of each; so 112 altogether.  That leaves 28 red and yellow marbles; therefore 14 red marbles.

so the rectangle is 80cm (area)

now to find the area of a triangle.

base times height.

4 times 8.

your answer is 96cm.

hope this .