Raju’s father’s age is 5 years less than four times Raju’s age. Find Raju’s age if his father’s age is 47 yrs.
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f=4s
f+5=3(s+5)
Those are “given”
distribute
f+5=3s+3(5)
do the math
f+5=3s+15
Subtract 5 from both sides
f=3s+10
Substitute our new value for f into the first equation
3s+10=4s
Subtract 3s from both sides
10=s
Substitute our new value for s into the first equation
f=4(10)
Do the math
f=40
The father is 40 and his son is 10
Checking our work
40 is four times 10, check
In five years, the father will be 45 and the son will be 15. 45 is three times 15
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