<h2>Step-by-step explanation:</h2><h3>The Lowest Common Multiples (LCM) of 8, 15 and 20 are</h3><h3>2, 3 and 5</h3><h3>so we times them together to get:</h3><h3>2 x 3 x 5 = 120</h3><h3>to get a 120 to a square number we have to find the (LCM) of 2, 3, and 5 which is 30 so we times 120 by 30 to get 3600</h3><h3></h3>