Oliver needed to build 10 chairs to go with a dining room table that he had built. At the start of the second day he had completed 4 chairs, and by the end of second day of work, he had worked for 9 hours and completed 7 chairs in total. How many more hours must he work before he will finish all 10 chairs? A) 3 B) 9 C) 10 D) 18

Question

Nancy Combs

Mathematics

13 December, 07:12

Oliver needed to build 10 chairs to go with a dining room table that he had built. At the start of the second day he had completed 4 chairs, and by the end of second day of work, he had worked for 9 hours and completed 7 chairs in total. How many more hours must he work before he will finish all 10 chairs? A) 3 B) 9 C) 10 D) 18

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Isabela Osborne · Answer 1

At the start of 2nd day, he completed 4 chairs ... at the end of the day, (9 hrs later) he completed 7 chairs ... that means he had completed (7-4) = 3 chairs in 9 hrs. 9/3 = 3 ... that means it takes 3 hrs to complete 1 chair.

He has 7 ... so he needs 3 more chairs ... and if 1 chair takes 3 hrs, then 3 chairs takes (3 * 3) = 9 hrs <===