Question

Total surface area of cuboid = 2(lb+bh+lh)

500 = 2×(l×6+6×5+l×5)

Find value of l

Answer 1

500=2(l6+30+l5)
500=2(11l+30)
500=22l+60
22l=500-60=440
l=440/22=20


Therefore l=20

I HOPE IT WILL HELP U...
THANK U ;)

Answer 2

hii!!

here's ur answer...

500=2[(l×6)+(6×5)+(l×5)]

500=2(6l+30+5l)

500=2(11l+30)

500=22l²+60

22l²=500-60

22l²=440

l²=440/22

l²=20

l=√20

hope this helps..!