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 at least 450 calories.

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book Other Question

5 years ago, a man was 7 times as old as his son. 5years hence, father will be 3 times as old as his son. Find their present ages. I am trying to help a friend with her homework, but we have both hit a brick wall, can someone send us the process to solve the following equation?
2/5(10x+25)=-10-4(x+3)
Thank you so much for your help.
Patty & Sunshine