The associative property of addition:
19 + 11 + 37 = (19 + 11) + 37 = 30 + 37 = 67
19 + 11 + 37 = 19 + (11 + 37) = 19 + 48 = 67
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The sequence of number is 7.
7 times 37 and 37 plus 37 plus 37 plus 37 plus 37 plus 37 plus 37 are the same value: 259
A potassium atom has 19 protons and 19 electrons, plus 20-22 neutrons. A rubidium atom has 37 protons and 37 electrons, plus 46-50 neutrons and so is bigger.
The answer is 144, because 1+3 is 4 add 5=9 add 7=16 add 9=25+11= 36+13=49+15=64+17=81+19=100+21=121+23=144. And there you go
11 So: x = 37