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Sagot :
Let x represent the number of Supra balls that were ordered
Let y represent the number of Lightning balls that were ordered
Supra balls cost $2.00
This means that the cost of x Supra balls is 2 * x = 2x
Lightning balls cost .90 each
This means that the cost of y Lightening balls is 0.9 * y = 0.9y
The total cost of the Supra balls exceeded the total cost of the Lightening balls by $132. This means that
2x - 0.9y = 132
If an equal number of each brand was ordered, it means that
x = y
2x - 0.9x = 132
1.1x = 132
x = 132/1.1
x = 120
This means that 120 of each balls were ordered. Recall, 1 dozen = 12 balls
120 balls = 120/12 = 10
Thus, 10 dozens of each brand were ordered.
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