Question 703921
{{{ 35 + x = 3*( 5 + x ) }}}
{{{ 35 + x = 15 + 3x }}}
{{{ 2x = 20 }}}
{{{ x = 10 }}}
In 10 yrs, Mr Tanaka will be 3 times as old as his Son.
check:
{{{ 35 + x = 3*( 5 + x ) }}}
{{{ 35 + 10 = 3*( 5 + 10 ) }}}
{{{ 45 = 3*15 }}}
{{{ 45 = 45 }}}
OK