Answer:
Ants weigh approximately 118,615,000mg more.
Step-by-step explanation:
Based on a quick search, the average housefly weighs around 11.5mg, while an ant averages at 3.5mg. With these average weights, we can calculate the total weight of each species.
Flies: 3,990,000 * 11.5mg = 45,885,000mg
Ants: 47,000,000 * 3.5mg = 164,500,000mg
Consequently, it's clear that the 47 million ants possess a greater mass, specifically
164,500,000 - 45,885,000 = 118,615,000mg more