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let Emily's age be and her aunt Ingrid
if Emily is one quarter or the age of aunt Ingrid, then we have:
....eq.1
if their total age is , then we have: .......eq.2
to find out how old is Emily, solve this system:
....eq.1 .......eq.2
---------------------------substitute for from eq.1 in eq.2
.......eq.2 ....solve for
now find ....eq.1
so, Emily is years old