Red and gray bricks were used to build a decorative wall. The number of red bricks / number of gray bricks was 5/2. There were 175 bricks in all. How many red bricks were used?(1 point)
Let x represent the number of red bricks used and let y represent the number of gray bricks used.
From the given information, we can set up the following two equations:
1. x/y = 5/2
2. x + y = 175
From equation 1, we can rewrite it as x = (5/2)y and substitute it into equation 2:
(5/2)y + y = 175
(7/2)y = 175
y = (2/7) * 175
y = 50
Now, we can substitute the value of y back into equation 1 to find the number of red bricks:
x = (5/2) * 50
x = 125
Therefore, 125 red bricks were used in building the decorative wall.