Question 1151751
Let {{{ n }}} = number of arrows he purchases
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{{{ 3*( n-3 ) + 70 <= 124 }}}
{{{ 3n - 9 + 70 <= 124 }}}
{{{ 3n <= 63 }}}
{{{ n <= 21 }}}
The maximum number of arrows is 21
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check:
3 arrows with the set
That leaves 18 arrows
{{{ 3*18 = 54 }}} dollars
{{{ 70 + 54 124 }}}