book Maths Puzzle Numerical Ability

2.6 52)

The electricity costs of a business decreased from 12,000 one year to 10,920 the next. what is the rate of decrease?

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book Other Question

Two numbers have a sum of 39. Their difference is 11. What are the two numbers. Please show me how to set this problem up. Thank you. two parallel chords, 16 cm and 30 cm are 23 cm apart. find the radius of the circle that contains them.