Question

A ribbon is 8 meters long. I need 11 peices ribbon each 90 cm long. How many centimeters shorter is the ribbon than the lenght I need ?​

Answer 1

Answer:

190cm answer

bcz 11*90

=990

We have only 800 cm clothe

Answer 2

190 cm of ribbon is shorter than the length that is needed.

There is a ribbon of certain length. The total length of the ribbon is given to be 8 m long which means that the amount of length available is 8 meters.

This ribbon is required to be divided into pieces of equal length and the number of pieces which the ribbon length needs to be divided to is 11 pieces.

The pieces of ribbon, that is, each piece is supposed to be 90 cm of length. This means that the total length of 8 meters needs to be cut into smaller pieces of each of length 90 cm.

However, if the 8 meter long ribbon can be divided into 11 pieces or not, needs to be found out. It is given that each piece of ribbon must be 90 cm long.

So by unitary method we have:

1 piece=90 cm

11 pieces=x cm

The length of 11 pieces of ribbon must first be found out in order to compare whether the 8 m long ribbon is sufficient to cut out 11 pieces of ribbon.

By cross multiplying we have:

$x=90\times11$

$\implies x=990\;cm$

This is the length of 11 pieces of ribbon.

The ribbon length that is available is given to be 8 m in length and hence to keep the units of measurements same we convert from m to cm.

We know that, 1 m=100 cm

S0, $\implies 8\m=8\times100=800\;cm$

So the total length of the ribbon is 880 cm.

It can thus be seen that the total length of ribbon available is insufficient which means that it is shorter than the required length.

Therefore, 11 pieces of ribbon cannot be obtained from this piece of ribbon.

The amount of centimetres it is shorter by will be given by the difference between them.

Thus we have:

$990-800=190\;cm$

Thus, this is the amount the ribbon is shorter by.

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