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Hi
k (a+b) = ka+kb
so : 8 (3x+4) = 8*3x +8*4 = 24x +32
3x : 2 = 15
3x = 15 * 2
3x = 30
x = 30 : 3
x = 10
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3(10) :2 = 15
1 hour = 60 minutes
60/3 is 20 minutes
20/4 is 5 minutes
Samantha spends 5 minutes on each chore