exam Maths Puzzle Numerical Ability

rolly is 9 years younger than greg. in seven years, he will be two years more than one-half as old as greg. find their present ages.

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THe base of a ladder is 14ft away from the wall. The top of the ladder is 17feet from the floor. Find the length of the ladder to the nearest thousandth.
how do you write 62,040,6.2 x 10^-2, 6.207 x 10^-3, 6.34 x 10^-1 in order from least to greatest?