" 8:81::64:? "

8:9:: 64 : ?

72. 49 : 81 : : 64 : ?

8:64::7: ?

64:8::16:4: ... ?...:2.

Factorise the following : 81 - 64x^2 .

What is the ratio of the total production of company A to the total sales of Company A ? (a) 81:64 (b) 64:55 (c) 71:81 (d) 71:55 (e) 81:55

Two coherent sources of intensity ratio 81:64 interfere. Deduce the ratio of intensities beween the maxima and minimain the interference pattern.

Find the sub-duplicate ratio of 81 : 64.

If 8a=9b then the ratio of (a)/(9)rarr(b)/(8) is 1:1 b.1:2 c.2:1 d.64:81 e.81:64

121 ? 81 64 49 36 25