book Maths Puzzle Numerical Ability

Patterns
rule for 10,11,9,12,8,13

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book Other Question

Hi, I have a question about the word problem:

Susan had $108 (in thousands) invested in three different mutual funds in a certain year. She earned a return of 12% on the first f 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 at least 450 calories.