Que no.8 with full process plz!!
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It contains 20% of zinc = 20/100.
You want to make 45 kgs of Zinc.
Your equation would be - 20% (kg of ore needed) = 45
20÷100 × (Ore in Kgs) = 45
20 (Ore in Kgs) = 45×100
20 (Ore in Kgs) = 4500
Ore in Kgs = 4500÷20
Ore in Kgs = 225.
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