Question

the sum of the first three multiples of the greatest two digits composite number is?​

Answer 1

$the \: greatest2 \: digit \: number \: is \: 99. \\ first \: three \: multiples \: of \: 99 \: are \: 99 </p><p>\\ 208 \: and \: 297. \\ therefore \: sum = \frac{3}{2} \times (99 + 297) \\ = \frac{3}{2} \times 396 \\ = 3 \times 198 \\ = 594.$

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