Red and grey bricks were used to build a decorative wall.
The number of red bricks
---------------------------------- was 5/2. There were 210 bricks used in all. How many red bricks were used?
the number of grey bricks
5 : 2 means that there are 5 + 2 = 7 equal parts
And the red bricks are 5/7 of the total....so.....
(5/7) 210 =
5 (210 / 7) =
5 (30) =
150 red bricks
And
The grey bricks are 2/7 of the total =
(2/7) (210) =
2 ( 210 / 7) =
2 (30) =
60 grey bricks
+2448 
