Question 684151
Let {{{ b }}} = Ben's age now
If Tom is 6, in 1 year he will be 7
In 1 year, Ben will be {{{ b + 1 }}}
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given:
{{{ b + 1 = 3*7 }}}
{{{ b = 21 - 1 }}}
{{{ b = 20 }}}
Ben is 20