Question

3. When my mother was 25,i was 7. Now she is thrice as old as me. How old am I? *​

Answer 1

$Let \: some \: years \: ago, \\Mother's \: age = 25 \:years$

$Son \: age \: was = 7 \: years$

/* After x years */

$Present \: age \: of \: mother = (25+x) \: years$

$Present \: age \: of \: son = (7+x) \: years$

$25 + x = 3( 7 + x )$

$\implies 25 + x = 21 + 3x$

$\implies x - 3x = 21 - 25$

$\implies - 2x = -4$

$\implies x = \frac{-4 }{-2}$

$\implies x = 2$

Therefore.,

$\red{ At \: present \:son \:age }\\= 7 + 2 \green { = 9 \: years }$

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