Question

Rukmini tied a satin ribbon around a scroll making 3 rounds using 56 cm of the
ribbon each time. She used another 12 cm to make a bow. Find the total cost of
the ribbon if the cost per meter was 15. Find the radius of the scroll.​

Answer 1

Given : Rukmini tied a satin ribbon around a scroll making 3 rounds using 56 cm of the  ribbon each time

She used another 12 cm to make a bow.

cost per meter was 15.

To Find : total cost of  the ribbon  

Solution:

Total length of ribbon used = 56 x 3  + 12

=  168 + 12

=  180 cm

= 180/100 m

= 1.8 m

cost per meter was 15.

Total Cost  = 15 x 1.8  =  27 Rs

56 cm  = perimeter  

=> 56 cm = 2π R

R = Radius of Scroll

=> 56 = 2(22/7) * R

=> R = 8.91  cm

radius of the scroll.​ = 8.91 cm

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