exam Maths Puzzle Numerical Ability

The weight of carbon (C) in a quantity of c3h3cl5 was 432 grams. What was the weight of the chlorine (cl) in the compound? (C,12;H,1;Cl,35)

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Between what two integers does the solution of log base 7 of x= 4.98 lie? Please explain. Thank you. Can someone help me with this problem?

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