Aptitude solving also comprises of few problems based on age calculation, they are normal but the sentences used there makes it look as if it is complex.
The main parts of Age-based problems are
Years ago age
Hence years age
We calculate age based problems using simple mathematic equations.
Few important formulae in making equations:
If current age is 'x',then 'n' times current age is 'xn'.
If current age is 'x',then age 'n' years later='x+n'.
Ages in ratio a:b will be 'ax' and 'b*x' respectively.
If current age is 'x',then age 'n' years before='x-n'.
If current age is 'x',then 1/n of age is x/n.
John's father said,"I was as old as you are now when you were born"
now son's age is 19, what is the age of John's father after 6 years.
years ago age(when john was born): f=19 ,j=0
present age: f=x (19+19),j=19
hence age: (after 6 years): 38+6=44 years
Raju's age after 15 years will be 5 times his age 5 years back, what is his present age?
Assumptionscurrent age c)(future age:f=c+15)(past age:p=c-5)
hence current age is 10 years.
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A's age : B's age = 5:2, after 5 years, the ratio becomes 35:23, find A's present age.
Present ages: 5 2 difference=3
Ages after 5 years: 35 23 difference=12
multiply the other's difference to this,
Present ages: 60x 24x
Ages after 5 years: 105x 69x
105x-60x=69x-24x=45x which is equal to 5 years
x=5/45 =1/9 years.
Age of A= 60(1/9) = 6.66