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Dimensions are 24cm by 12cm
I suggest you draw a picture
the formula is 2w+2l=P
put in all of the. information you know
2w+2l=72
you also know that length equals twice the width
l=2w
substitute that into equation
2w+2(2w)=72
2w+4w=72
6w=72
w=12
we have the width, now the length
l=2w
l=2(12)
l=24
length is 24cm
width is 12cm
check:
2(12)+2(24)=72
24+48=72
72=72
answers are correct
I suggest you draw a picture
the formula is 2w+2l=P
put in all of the. information you know
2w+2l=72
you also know that length equals twice the width
l=2w
substitute that into equation
2w+2(2w)=72
2w+4w=72
6w=72
w=12
we have the width, now the length
l=2w
l=2(12)
l=24
length is 24cm
width is 12cm
check:
2(12)+2(24)=72
24+48=72
72=72
answers are correct