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dolphi86 [110]
3 years ago
7

If Fran were to paint her living room alone, it would take 6 hours. Her sister Denise

Mathematics
1 answer:
natita [175]3 years ago
3 0

Answer:

r1 =6

r2 =8

t = ?

[(1/r1) * t] + [(1/r2)*t] = 1

t/6 + t/8 = 1

multiply by common denominator... 24

24 (t/6 + t/8 = 1)

4t + 3t =24

7t = 24

t = 24/7 = 3.4hrs

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