Question

1. quincy is using 320 pieces of stone tile to make a red, white, and blue mosaic. if 20% of pieces are blue and 35% are white, how many pieces are red? your answer should be a number, not a percent.

Explanation:

Step1: Calculate total percentage of blue and white tiles

The percentage of blue tiles is 20% and white tiles is 35%. So the total percentage of blue and white tiles is $20\% + 35\% = 55\%$.

Step2: Calculate percentage of red tiles

Since the total percentage of all tiles (red, white, blue) is 100%, the percentage of red tiles is $100\% - 55\% = 45\%$.

Step3: Calculate number of red tiles

The total number of tiles is 320. To find the number of red tiles, we calculate 45% of 320. Mathematically, that is $0.45\times320 = 144$.

Answer:

144