As shown in the figure, the shadow is 2 / 5 of the area of the big circle and 1 / 3 of the area of the small circle. What is the ratio of the area of the big circle to the area of the small circle

As shown in the figure, the shadow is 2 / 5 of the area of the big circle and 1 / 3 of the area of the small circle. What is the ratio of the area of the big circle to the area of the small circle

(1) Because the shadow is 2 / 5 of the area of the big circle and 1 / 3 of the area of the small circle, we can get the following equation:
Large circle area × 2 / 5 = 1 / 3 of small circle area Change the equation into the proportion formula and simplify the ratio
Large circle area: small circle area = 1 / 3:2 / 5 = 5:6