answer of 1 question only (give full solution)
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Step-by-step explanation:
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Answer:
= 84
Step-by-step explanation:
N1 D1 = N2D2 + N3 D3
90 × 300 = 300×20 +250×D
2700 = 600+ 25D
25D - 22700 - 600 = 2100
D = 2100/27
D = 84
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