a number has 3 digits and is odd. two digits are the same. the sum of the digits in the tens and ones place is odd. the sum of the digits is 4. what is the number?​

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?

The track team ran a mile and a quarter during their practice how many kilometers did her team runs?

Ineed to know how to write question one in mathematical terms