Question 835215
Let {{{ a }}} = number of munchkins bought each month
Let {{{ b }}} = number of regular donuts bought each month
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(1) {{{ a + b = 62 }}}
(2) {{{ 25a + 100b = 2450 }}}
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Multiply both sides of (1) by {{{ 25 }}}
and subtract (1) from (2)
(2) {{{ 25a + 100b = 2450 }}}
(1) {{{ -25a - 25b = -1550 }}}
{{{ 75b = 900 }}}
{{{ b = 12 }}}
and, since
(1) {{{ a + b = 62 }}}
(1) {{{ a = 62 - 12 }}}
(1) {{{ a = 50 }}}
You bought 50 munchkins
You bought 12 regular donuts