Total number of miles of land = 1500 miles square.
Number of mosquitoes in a swarm in a mile square of land = 70 millions mosquitoes.
We need to find the number of mosquitoes are there in a 1500 miles swarm.
In order to find the number of number of mosquitoes are there in a 1500 miles swarm, we need to multiply 1500 by 70 millions.
Therefore,
Number of mosquitoes are there in a 1500 miles swarm = 1500 × 70
= 105000 millions.
1 million = 10^6.
105000 millions = 105000 × 10^6 = 1.05 ×10^11 mosquitoes.
So, the final answer is 1.05 ×10^11 mosquitoes in 1500 miles square land.
