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Bunuel
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U can solve this Without equation also
We know that F= 35 and s=5
Then they asked in how many years the father will be triple the son age F=3*S
So if we try all options
A ( f=40 & s=10 ) so 10*3 = not similar to dad ❌
B (f= 41 & s= 11).... 33 ❌
C (f=42 & s=12) .... 36 ❌
D (f=43 & s=13) .... 39 ❌
E (f=45 & s=15) .... 45
So option E 10 is the answer
Cause 15*3 = 45

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