Bishakha K.
asked • 02/10/18
The present ages of A and B are in ratio 7:5 . Ten years later ages will be in ratio 9:7 . Find their present ages?
Want to ask maths questions
Bobosharif S.
answered • 02/10/18
PhD in Math, MS's in Calulus
A:B=7:5
(A+10)/(B+10)=9:7
5A=7B
7A+70=9B+90
5A=7B
7A-9B=20 (7A=2A+5A=2A+7B)
5A-7B=0
2A-2B=20
5A-7B=0
A-B=10
A=35
B=25
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