Solve :
$3 a / 4 + a / 6 = 66$ .

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Solution

It is given that
$3 a / 4 + a / 6 = 66$
Taking LCM
$(9 a + 2 a) / 12 = 66$
$11 a / 12 = 66$
By cross multiplication
$11 a = 66 \times 12 = 792$
So we get
$a = 792 / 11 = 72$ .

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