Answer:
15
Explanation:
45 = 1 × 3^2 × 5
60 = 2^2 × 3 × 5
75 = 3 × 5^2
greatest number than divides 45, 60 and 75 without leaving remainder = GCF of 45,60,75 = 3 × 5 = 15
15×3=45
15×4=60
15×5=75
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