P5/P6: Ratio : Difference Unchanged (Age)

Age comparison questions are common in P4 but in P5 ratio will be used(instead of fractions or multiples) to compare the ages.

These questions requires the concept of "Difference Unchanged".
Similar questions can be viewed here.

Such before and after questions will usually appear in Paper 2 of P5 exams.
Caculator usage is allowed.

The ratio of Hannah's age to Grace's age was 5:6 at first.
10 years ago, the ratio of their age was 5:8.

How old is Grace now?



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