<span>Subtotal age of first 4 </span> <span>4 * 23 </span> <span>92 </span>
<span>Subtotal of last 3 </span> <span>3 * 34 </span> <span>102 </span>
<span>In the total of the first 4 and last 3 </span> <span>the 4th person has been counted twice. </span> <span>This second time must be subtracted. </span>
<span>Therefor </span> <span>92 + 102 - x = 162 </span> <span>194 - x = 162 </span>
<span>Subtract 194 from both sides </span> <span>-x = -32 </span>
<span>Multiply both sides by -1 </span> <span>x = 32
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