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Let the number of supervisors be 7x, therefore the number of managers is 4x
If 8 of the supervisors become managers:
Number of supervisors: 7x – 8
Number of managers: 4x + 8
(𝟕𝒙 − 𝟖) / (𝟒𝒙 + 𝟖) = 5/4
28x – 32 = 20x + 40
8x = 72
x = 9
Number of supervisors = 9 x 7 = 63
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