SOLUTION: Angela created a mosaic design using square 4-by-4 cm white tiles and rectangular 4-by-5 cm black tiles. She used twice as many white tiles as black tiles. The finished pattern was
Question 1188672: Angela created a mosaic design using square 4-by-4 cm white tiles and rectangular 4-by-5 cm black tiles. She used twice as many white tiles as black tiles. The finished pattern was 2704 sq cm in area. How many rectangular tiles did she use? Answer by ikleyn(52798) (Show Source): You can put this solution on YOUR website! .
x black tiles and 2x white tiles.
Write the total area equation
20x + 16*(2x) = 2704 cm^2
20x + 32x = 2704
52x = 2704
x = 2704/52 = 52.
ANSWER. 52 black rectangular tiles.