1.

यदि `A : B = 3 : 4m B : C = 5 : 7` और `C : D = 8.9` तब A : D किसके बराबर है?A. `3:7`B. `7:3`C. `21: 10`D. `10 : 21`

Answer» Correct Answer - D
`{:("A : B","B : C","C : D"),("3 : 4","5 : 7","8 : 9"):}`
`(A)/(B)=(3)/(4),(B)/(C)=(5)/(7)=(C)/(D)=(8)/(9)`
`(A)/(B)xx(B)/(C)xx(C)/(D)rArr(3)/(4)xx(5)/(7)xx(8)/(9)`
`rArr (10)/(21)`
`A : D = 10 :21`


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