Question

- Todd uses 21 white tiles and some black tiles to make a mosaic. The mosaic has a total area of ​​144 square centimeters. Each tile has an area of ​​3 square centimeters. How many black tiles did Todd use? Explain.

(Help me please)

Answer 1

The answer is 27 tiles !

21 white tiles × 3 = the total area it takes up!

21 × 3 = 63

144 - 63 = 81

81 is the area left!

Divide by 3 to find how many black tiles are needed!

81÷ 3 = 27

Hope I Helped !

Answer 2

48

Explanation:

21 white tiles = 63 cm2

total number is 144

144-63 = 81

81/3 = 27

so 27 black tiles

21+27 = 48 total.