x = number of chicken eggs
312/2 = x/7
2 (x) = (312) (7)
2x = 2,184
2x/2 = 2,184/2
x = 1,092
Answer: There are 1,092 chicken eggs in the store.
The ratio of duck eggs to chicken eggs is 312 : 1,092.
Simplified (divide each number by GCF 156), the ratio is 2 : 7.