Prove the following just by drawing a single line:
5 + 5 + 5 = 550 [You cannot use the line on equality.]
THE EASY ONE - Use a number 3 times and addition sign(s) to get the number 60. You cannot use 20.
Another EASY ONE - Use the following only once to make an equation-
2, 3, 4, 5, = , +.