math
posted by cora evans .
I'm not understanding and writing the following proportion: 8 is to 64 as 2 is to x, can somebody explain how to solve this problem.

A survey indicated that 3 out of doctors used brand x aspirin. if 2000 doctors were surveyed, how many used brand X?
I need help understanding the problem of this math. Can somebody explain this to me. 
Here's the first one.
8/64 = 2/x
Cross multiply.
8x = 128
Solve for x.
x = 128/8
x = 16
You haven't posted enough information to solve the second problem. 
Solve for x 8 is to 64 as 2 is to x

A survey indicated that 3 out of 5 doctors use Brand X aspirin. If $2,000 were surveyed, how many used Brand X?