Question

The number of hours left in a day is double the number of hours already passed. How many hours have already passed?

Answer 1

take number of hours left in the day as 'x'

so, number of hours already passed = 24-x

x = 2(24-x)

x = 48 - 2x

3x = 48

x = 16

number of hours already passed = 24-16 = 8 hours

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Answer 2

↑ Here is your answer ↓
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Let the number of hours left be 'x',

Hours passed be 'y',

$x = 2y --(1)$

$x+y = 24 --(2)$

Sub (1) in (2),

$2y + y = 24$

$3y = 24$

$y = 24/3$

$y = 8$

So, 8 hours have already passed