Answer:
yes
Step-by-step explanation:
80 ÷ 20 = 4
56 ÷ 14 = 4
yes they are equivalent
let's multiply both sides by the LCD of all fractions, in this case is 4, just to do away with the denominators for a few seconds
d + m = 100
12d + 10m = 1120
d = 60
m = 40