Question
The average age of a father, mother, and daughter is 26
years. The average age of the mother and daughter is twice the age of the daughter. If the ages of the father and mother are in the ratio 4:3, respectively, then find the age of the father.Solution
ATQ, Total age of father, mother, and daughter = 26 x 3 = 78 years. Let the age of the daughter be 's' years. So, average age of mother and daughter = 2s years. So, sum of ages of mother and daughter = 2 x 2s = 4s years. So, age of the mother = 4s - s = 3s years. So, age of the father = 3s x (4/3) = 4s years. ATQ: 4s + 3s + s = 78 Or, 8s = 78 So, s = 78 / 8 = 9.75 years. So, age of the father = 4s = 4 x 9.75 = 39 years. Therefore, the father is 39 years old.
16 4 2 1.5 1 1.875
...512   493   476   ?    448    437  . Â
16 23 31 40 50 61 ?
...50 62 ? 96 126 138
...1 0.5 3 7.5 21.5 74.25
Given below are three series I, II and III. Each series consist an odd one out number. Odd one out number in series I, II and III are 'P', 'Q' and 'R',...
114 106 102 100 99 ?
...A factory produces two types of gadgets: Type A and Type B. In a day, it produces 300 Type A gadgets and 400 Type B gadgets. If the production cost of T...
3,   2,   3,  8,  31,  ?
40, 20, 30, 75, ?, 1181.25
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