Question

the sum of the digits of a certain two-digit number equals the square root of the number? what is the number?

Answer 1

conside the number 23
\(23 = 2\times10+3\)
so if a number is formed by two digits "a" and "b"
then the number is \(a\times10+b\)

Answer 2

so, the condition in the problem gives us:
\[a+b=\sqrt{a\times10+b}\]

Answer 3

thx. you