exam Maths Puzzle Numerical Ability

You have $22 in your bank account and deposit $11.50 each week. At the same time your cousin has $218 but is withdrawing $13 each week. Write and solve a system of equations to det

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How would I solve this for kj?:

ln(kj/15) = 2ln(kj/60)

The answer is kj = 240, but I am unsure as to how to get there. Thanks for your help. A bakey sells 50 loaves a day of a particular bread at $1.50 a loaf. Research indicates that, for every 10 cents increase in the price, two fewer loaves would be sold. An equation