The average age of 3 students is 21 years. If the ratio of their ages is x : y : z, find the value with which y is related. It is known that x : y = 1 : 2 and y : z = 1 : 3.

The average age of 3 students is 21 years. If the ratio of their ages is x : y : z, find the value with which y is related. It is known that x : y = 1 : 2 and y : z = 1 : 3. Correct Answer 14 years

x : y = 1 : 2 and y : z = 1 : 3 X : y : z = 1 * 1 : 2 * 1 : 3 * 2 1 : 2 : 6 Let these ratios be in terms of a. A + 2a + 6a = 21 * 3 = 63 years 9a = 63 years A = 63 / 9 = 7 years Y = 2a = 7 * 2 = 14 years
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