exam Maths Puzzle Numerical Ability

multiply (984.5)(1000)

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exam Other Question

inverse of y=4(x-2)+9

I can do easy questions but not this please help and quickly ,thanking you in advance please do quickly as in for early tomorrow mourning many thanks A chemist has one solution that is 40 percent pure glycoside and another solution that is 80 percent pure glycoside. How many pounds of each solution must be used to produce 100 pounds of a solution that is 60 percent glycoside?