Question 890952
mass of small cake, y
mass of big cake, x


{{{3*x+4*y=9.62}}} kg, accounting for mass of the bought seven cakes.


Mass relation description gives {{{x=2y}}}, but possible misunderstanding.


{{{3x+4(2x)=9.62}}}
{{{12x=9.62}}}
{{{x=9.62/12}}}
{{{x=0.8017}}}, mass of one big cake.
-
{{{y=x/2}}}
but you want to know 4y, meaning FOUR of the small cakes mass.
{{{4y=4(x/2)=4(0.8017)/2}}}
{{{highlight(4y=1.603)}}}
To one decimal place, 1.6 kg.