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Answer:
It would take 600 training sessions to make the two salary options equal
Step-by-step explanation:
Let x be the number of sessions
25000 + 15x = 10000 + 40x
Transpose
25000 - 10000 = 40x - 15x
15000 = 25x
Divide both sides by 25
600 = x
x = 600
Check:
25000 + 15(600) = 10000 + 40(600)
25000 + 9000 = 10000 + 24000
34000 = 34000 ✓