The decimal number equivalent of the binary number 11111 is 31. Here's how to convert it: Understand place values: In binary, each digit represents a power of 2, starting from the rightmost digit as 2^0, then 2^1, 2^2, and so on.Calculate the values:1 * 2^0 = 11 * 2^1 = 21 * 2^2 = 41 * 2^3 = 81 * 2^4 = 16Sum the values: 1 + 2 + 4 + 8 + 16 = 31