If a:2 = b:5 then how many % of b is a (a) 20 (b) 30 (c) 40 (d) 50

If = , then find the value of

If a, b, c are in continued proportion, then prove that

If the fourth and fifth of the five numbers in continued proportion are 54 and 162 respectively, find the first number.

Find the mean proportion of xy² and xz²

If (b + c - a)x = (c + a - b)y = (a + b - c)z = 2, then prove that (1/x + 1/y)(1/y + 1/z)(1/z + 1/x) = abc.

The corresponding sides of two similar triangles are ____.

State True or False: The compound ratio of 2ab : c², bc : a² and ca : 2b2 is 1 : 1.

Find the third proportional of 5, 10.

If A : B = 2 : 3, B : C = 5 : 8, C : D = 6 : 7, then A : D = (a) 2 : 7 (b) 7 : 2 (c) 5 : 8 (d) 5 : 14

Find the ratio of the cost price and selling price of an article which is sold at 25% profit

If (3x − 2y) : (3x + 2y) = 4 : 5 then what is (x + y) : (x − y)?