The product of the duplicate ratio of `2a :6b\ a n d\ ` the reciprocal ratio f `4a^2: 25 b^2` is `0` b. `1` c. `a : b` d. none of these

The product of the duplicate ratio of 2a:6b backslash and the reciprocal ratio f4a^(2):25b^(2) is 0 b.1 c.a:b d.none of these

Find the : (i) duplicate ratio of 2sqrt(2) : 3sqrt(5) (ii) triplicate ratio of 2a : 3b , (iii) sub-duplicate ratio of 9x^(2)a^(4) : 25y^(6)b^(2) (iv) sub-triplicate ratio of 216 : 343 (v) reciprocal ratio of 3: 5 (vi) ratio compounded of the duplicate ratio of 5 : 6 , the reciprocal ratio of 25 : 42 and the sub-duplicate ratio of 36 : 49 .

Write True or false : (a) The duplicate ratio of 1 : ab is 1 : a^(2)b^(2) (b) The sub-duplicate ratio of 4:9 is 3:2.

If a ,\ b ,\ c are in proportion, then (a) a^2=b c (b) b^2=a c (c) c^2=a b (d) None of these

If the volumes of two cubes are in the ratio 8:1, then the ratio of their edges is 8:1 (b) 2sqrt(3):1( c) 2:1 (d) none of these

If a ,b ,and c are in A.P., then a^3+c^3-8b^3 is equal to (a). 2a b c (b). 6a b c (c). 4a b c (d). none of these

If a ,b ,and c are in A.P., then a^3+c^3-8b^3 is equal to (a). 2a b c (b). 6a b c (c). 4a b c (d). none of these

If 25 a+25 b=115 , what is the average of a and b ? (a) 2.5 (b) 3.4 (c) 4.5 (d) 4.6 (e) None of these

If the volumes of two cubes are in the ratio 8:1, then the ratio of their edges is (a) 8:1 (b) 2sqrt(3):1 (c) 2:1 (d) none of these

The roots of the equation ax^2+bx+c=0 will be reciprocal of each other if a)a=b b)c=a c)b=c d)None of these