DCEWLET
Ten years ago a father was 7time as old as his
son, and 15 years hence father will be twice
as old as his son .find their present ages.
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1
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physics, a force is any interaction that, when unopposed, will change the motion of an object. A force can cause an object with mass to change its velocity, i.e., to accelerate. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it
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Let S= age of son at present
S-10= age of son 10 years ago
S+2= age of son 2 years from now
F= age of father at present
F-10= age of father 10 years ago
F+2= age of father 2 years from now
F-10= 7(S-10) = 7S-70, F-7S = -60, F= 7S-60 Eq. 1
2(F+2)= 5(S+2)
2F +4= 5S+10 Eq. 2
2F-5S= 6. but F=7S-60
2(7S-60)-5S=6
14S-120–5S=6
9S=126
S= 126/9=14 years old at present
F=7(14)-60= 98–60= 38 years old at present
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