exam Maths Puzzle Numerical Ability

1. 3-(2+3x)

2. 8d-(4d+2)

3. 5+4(5n-3)-5n

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exam Other Question

One computer can process a payroll in 60 minutes. A newer computer can process a payroll in 40 minutes. How long would it take to process the payroll if both computers worked together? A nurse wants to add water to 30 ounces of a 10% solution of benzalkonium chloride to dilute it to an 8% solution. How much water must she add?