



 
Hi, Mark can paint a picture in 3 hours so it takes Henry 3 ×3 = 9 hours to paint a picture. The approach to this problem is to think in terms of the rates at which they work. Mark can paint a picture in 3 hours so he paints at the rate of 1/3 of a picture per hour. So, how many pictures does he paint in 10 hours? Apply this technique to Henry also. Penny  


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