Question 1053343
Let {{{ a }}} = the price of a cream bun
Let {{{ b }}} = the price of a mince pie
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(1) {{{ 5a = 9b + 75 }}}
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Subtract {{{ 75 }}} from both sides
(1) {{{ 5a - 75 = 9b }}}
Divide both sides by {{{ 9 }}}
(1) {{{ b = ( 5a - 75 ) / 9 }}}
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Given:
{{{ a = 60 }}}
(1) {{{ b = ( 5*60 - 75 ) / 9 }}}
(1) {{{ b = ( 300 - 75 ) / 9 }}}
(1) {{{ b = 225/9 }}}
(1) {{{ b = 25 }}}
One mince pie costs 25 p