Family

Son is 3/5 smaller than the mother. Mother is 99 cm higher than the son. How tall is the mother?

Correct result:

m =  165 cm

Solution:


s = m - 3/5 m
m = 99 + s

s = m - 3/5•m
m = 99 + s

2m-5s = 0
m-s = 99

m = 165
s = 66

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