book Maths Puzzle Numerical Ability

jumping rope can burn 600 calories per hour. Write and solve an inequality to find the number of hours of jumping rope that it would take for you to burn atleast 450 calories.

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book Other Question

what's an integer for the expression -(17)? Debit-card transactions. The total volume (in US dollars) of debit card transactions was $8.2 billion in 1990. In 1999, the total was $157.9 billion. Find the average rate of change in total debit card transactions from 1990 to 1999.