Question 905773
The ratio is LONGER:SHORTER, and you have y:42 and want to find y.


{{{4/3=y/42}}}
Multiply both members by 42.
{{{(4/3)*42=(y/42)*42}}}
{{{4*42/3=y}}}
{{{y=4*21*2/3}}}
{{{y=4*7*2}}}
{{{highlight(y=56)}}}


How much framing material?
The carpenter uses FOUR sides to make this rectangular frame.
Two sides are 42 cm and two sides are 56 cm.
The distance around the frame, corresponding to the amount of framing material, is {{{42+42+56+56}}}.