Suppose that it takes john 9 hours to paint a barn if he works alone and it takes carl 6 hours to paint the same barn if he works alone. how long will it take them to paint the barn, in hours, if they work together?

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I'll do the first one for you. it isn't very hard at all.on number one, you have (50 × 3), which equals 150, and (3 × 3), which equals 9. after you establish that, you add 150 and 9 together. so, (150 + 9) equals 159.this means that 53 × 3 = 159.