350 square feet requires 1 gallon of paint. assign gallons_paint with the amount of paint required for wall_area. sample output for the given program: 250.0 square feet wall will need: 0.714285714286 gallons of paint

Here's a solution in node.js. Can be easily transcribed to other languages:

var paint_per_sqf = 1/350;
var wall_area = 250.0;
var gallons_paint = wall_area * paint_per_sqf;

console.log(wall_area.toFixed(1) + " square feet wall will need:");
console.log(gallons_paint.toFixed(12) + " gallons of paint");

Multitouch interface;