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Jack is now 14 years older than Bill. If in 10 years Jack will be twice as old as Bill, ...

Jack is now 14 years older than Bill. If in 10 years Jack will be twice as old as Bill, how old will Jack be in 5 years?
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  • A 9
  • B 19
  • C 21
  • D 23
Correct Answer: Option C
Explanation:
Let \(J = Jack\) and \(B =\) Bill
\(J = B +14\)
\(J- B =14 \ldots \ldots(1)\)
\(J +10=2( B +10)\)
\(J +10=2 B +20\)
\(J-2 B=20-10\)
\(J-2 B=10 \ldots .(2)\)
Subtract eqn (1) from eqn (2)
\(B=4\), Put \(B=4\) into eqn (1)
\(J-4=14\)
\(J=14+4=16\)
In 5 years time, Jack will be
\(J +5=16+5=21\) years

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