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x+y=54 x-y=20 solving it,we get x=37 and y=17
53 and 55.
One is 54 below zero and the other is 49 above. To help visualize this, think of negative numbers as feet below water and positive numbers as feet above the water line. Alternately, you can think of temperatures, above and below zero. So the difference between -54 and 49 is the sum of 54 and 49.
54 and 57 are multiples of 3.
The are: 121 144 169 and 196