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Question

This is a P6 math question.  Can anyone help with the working method and answer please? Thank you.

Azizah is 10% lighter than Bala. Bala is 10% lighter than Caili. How many percent is Azizah lighter than Caili?

Answer

This is a Part Whole question.

       Azizah   Bala    caili total 
  90u 100u  110u  300u
         

90/110 × 100 = 81.81%

100% – 81.81% = 18.18%

 

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Let Caili’s weight be 100%

Bala = 90% x 100% = 90%

Azizah = 90% x 90% = 81%

Azizah is 100%-81% =  19%  lighter than Caili#


Let Caili’s weight be 110u

Bala = 90% x 110u = 99u

Azizah = 90% x 99u = 89.1u

Azizah = 89.1u/110u x 100% of Caili = 81% of Caili

Azizah is 100%-81% =  19%  lighter than Caili#



Let Caili’s weight be 5p

Bala = 90% x 5p = 4.5p

Azizah = 90% x 4.5p = 4.05p

Azizah = 4.05p/5p x 100% of Caili = 81% of Caili

Azizah is 100%-81% =  19%  lighter than Caili#

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