exam Maths Puzzle Numerical Ability

An experienced accountant can balance the books twice as fast as a new accountant. Working together it takes the accountants 6 hours. How long would it take the experienced accountant working alone?

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how many gallons of a 5% acid solution should be mixed with 30 gallons of a 10% acid solution to obtain a mixture that is 8% acid? You purchase a prepaid telephone card. The card costs $12.00. Each minute you
use costs $0.30.

a)Determine the slope of the line that models these points.

b)Find the equation of the line for this graph.