Guide :Middle School

At Roberto’s construction site, the crew can frame a wall in 35 minutes and frame the opening for a door in 21 minutes. The crew needs 9 loads of materials

At Roberto’s construction site, the crew can frame a wall in 35 minutes and frame the opening for a door in 21 minutes. The crew needs 9 loads of materials for each wall and 13 loads of materials fo
D - the number of doors.w - the number of walls:35 w + 21 d = 5979 w + 13 d = 267---------------------------We can also solve this system:35 w + 21 d = 597   / : 7--------------------------------5 w + 3 d = 85       / * ( - 9 )9 w + 13 d = 267   / *   5---------------------------------- 45 w - 27 d = - 765  + 45 w + 65 d = 1335-----------------------------            38 d = 570d = 570 : 38 = 155 w + 45 = 855 w = 40w = 8Answer:D ) 35 w + 21 d = 595        9 w + 13 d = 267  ...

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