7x = 1.40
x = .20
2x = 0.40
4x = 0.80
5x = 1.00
7x = 1.40
sum = $3.60
x = .20
2x = 0.40
4x = 0.80
5x = 1.00
7x = 1.40
sum = $3.60
Given that the ratio of the amounts contributed is 2:4:5:7, we can assign variables to represent the amounts contributed by each friend. Let's call these variables a, b, c, and d, respectively.
According to the given information, the largest amount contributed is $1.40, which corresponds to 7 units in the ratio. Therefore, we can set up the following equation:
7 units = $1.40
To find the value of one unit, we can divide both sides of the equation by 7:
1 unit = $1.40 / 7
= $0.20
Now that we know the value of one unit, we can determine the amounts contributed by each friend by multiplying the unit value by the corresponding ratio:
Friend 1: a = 2 units = 2 * $0.20 = $0.40
Friend 2: b = 4 units = 4 * $0.20 = $0.80
Friend 3: c = 5 units = 5 * $0.20 = $1.00
Friend 4: d = 7 units = 7 * $0.20 = $1.40
To find the total amount contributed by the four friends, we add up their individual contributions:
Total = a + b + c + d
= $0.40 + $0.80 + $1.00 + $1.40
= $3.60
Therefore, the total amount contributed by the four friends is $3.60.