SOLUTION: MATHS Q:
A girl went to school nd her teachr askd,how old ar u?she replied i dnt knw ,bt i knw dat am half my mum's age,de teachr askd hw old is yo mum?she replid i dnt knw bt my
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Question 1043243: MATHS Q:
A girl went to school nd her teachr askd,how old ar u?she replied i dnt knw ,bt i knw dat am half my mum's age,de teachr askd hw old is yo mum?she replid i dnt knw bt my dad is 5yrs oldr than my mum.de teach askd how old is yo dad she replied i dnt knw bt i knw dat if u add our ages the answr is 100years.
>nw hw old is
..de girl?
..her mum? and
..her dad?
am waiting 4 da answ==
(15min).
Answer by Cromlix(4381) (Show Source): You can put this solution on YOUR website!
Hi there,
Girl is 1/2 Mum's age
G = 1/2M .........(1)
Dad is 5 years older than Mum
D = 5 + M.........(2)
Add Dad's + Girl's and Mum's ages = 100
D + G + M = 100........(3)
.....................
Replace D with 5 + M (Eq 1)
Replace G with 1/2M (Eq 2)
in Equation (3)
D + G + M = 100
(5 + M) + 1/2M + M = 100
5 + M + 1/2M + M = 100
Collect like terms
M + 1/2M + M = 100 - 95
5/2M = 95
M = 92 x 95)/5
M = 38
G = 1/2M .........(1)
Girl = 19 years old
D = 5 + M.........(2)
Dad = 43 years old
Mum = 38 years old
D + G + M = 100........(3)
43 + 38 + 19 = 100
Hope this helps :-)
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