Question 1136554

Four packs of sandwiches and five drinks cots £10.60.If one drink costs 80p,how much is each sandwich? 

let sandwich be {{{x}}} and drink {{{y}}}

if four packs of sandwiches and five drinks cots £{{{10.60}}}, we have

{{{4x+5y=10.60}}}.....eq.1

if one drink costs {{{80p}}}=£{{{0.80}}}, we have

{{{5y=5*0.80}}}
{{{5y=4.00}}}

then
{{{4x+4.00=10.60}}}.....eq.1

{{{4x=10.60-4.00}}}

{{{4x=6.60}}}

{{{x=6.60/4}}}

{{{x=1.65}}}

=> the price of sandwich is £{{{1.65}}}