exam Maths Puzzle Numerical Ability

If Leah is 6 years older than her sister, Sue,and John is 5 years than Leah, and the total of their ages is 41. Then how old is Sue?

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I need some help on this problem.

I need to arrange the following numbers from smallest to largest:

3.07, 37/10, 3.0712, 3.078, 371/100, 3.0717, 3.072, 3.071

Thanks! Please help Simplify 6a^2(a^2-7a+3)