Question: What is the binary representation of the decimal number 20?

Answer:

To convert decimal to binary, calculate the sum of (2^n) * (bit value) for each bit position. In this case, it's (2^4 * 1) + (2^3 * 0) + (2^2 * 1) + (2^1 * 0) + (2^0 * 0) = 10100.