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Question

The floor in a restaurant is tiled with identical black, blue and green tiles. 40% of the floor tiles are black. 35% of the remaining tiles are green, and the rest of the 468 tiles are blue.

a) What percentage of the tiles are green?

b)How many tiles in total were used for tiling the restaurant floor?

Answer

Here’s my answer:
a) 100%—40%=60%
60%×35%=21%
b) 100%—40%—21%=39%
468÷39%=1,200
Ans: a) 21%
b) 1, 200

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(a)
100 – 40 = 60
35% x 60% = 21% (green)

(b)
60 – 21 = 39
39% ——-> 468
1% ——-> 12
100% ——-> 1200

Ans : (a) 21%; (b) 1200 tiles.

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Black : Remainder

    40   :    60

               Green : Blue : Total

                   7      :   13   :  20  (×3)

                  21     :   39    :  60

 

Black:Green:Blue:Total

  40    :   21   :   39  :  100

a) % green –> (21/100)×100%

                      = 21%

b) 39u=468

      1u = 468÷39

            = 12

     100u = 100×12

                =1200

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Black : Remainder

    40   :    60

               Green : Blue : Total

                   7      :   13   :  20  (×3)

                  21     :   39    :  60

 

Black:Green:Blue:Total

  40    :   21   :   39  :  100

a) % green –> (21/100)×100%

                      = 21%

b) 39u=468

      1u = 468÷39

            = 12

     100u = 100×12

                =1200

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