Can someone help with this and give me an explanation on how u get im struggling and im giving thx so much

Given a circle with measures of (c, d, and r) and a circle with measures of (c', d', and r'), what is d if c c' = 12 and d' = 0.50? a) 3 b) 6 c) 12 d) 24

5,600 x 10^3 = a) 560 b) 5,000,600 c) 5,600,000 d) 56,000

Jane’s favorite fruit punch consists of pear, pineapple, and plum juices in the ratio 5: 2: 3. how many cups of pear juice should she use to make 20 cups of punch?