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Subject :IMO    Class : Class 7

The points A, B, C and D lie on a straight line. The ratio of the length of AB to the length of BC is 3 : 4 and the ratio of the length of AC to the length of CD is 2 : 1. Find the ratio of the length of BC to the length of AD.



A21 : 8
B1 : 21
C8 : 21
D5 : 6


explain please

Ans 1:

Class : Class 9

Ans 2:

Class : Class 8

Ans 3:

Class : Class 7

Ans 4:

Class : Class 8

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