[Uncle Laem]

ข้อ 6

$\frac{1}{x} +\frac{1}{y} =\frac{19}{94} =\frac{95}{470}$
$470 = 1\times 470 = 5\times 94$
$\frac{1}{x} +\frac{1}{y} = \frac{94}{470} +\frac{1}{470} = \frac{95}{470}= \frac{19}{94}$
$\frac{1}{x} +\frac{1}{y} = \frac{1}{5} +\frac{1}{470}$
$x + y = 5 + 470 = 475$