Question
Present ages of ‘A’, ‘B’ and ‘C’ are in the
ratio 8:9:12, respectively. If present average age of ‘A’ and ‘C’ is 20 years, then find the age of ‘B’ when ‘C’ was 20 years old?Solution
Let the present ages of ‘A’, ‘B’ and ‘C’ be ‘8x’ years, ‘9x’ years and ‘12x’ years, respectively. ATQ; (12x + 8x) ÷ 2 = 20 Or, 20x = 40 So, x = 2 So, present age of ‘C’ = 12 × 2 = 24 years Present age of ‘B’ = 9 × 2 = 18 years Difference between the ages of ‘B’ and ‘C’ = 24 – 18 = 6 years So, age of ‘B’ when ‘C’ was 20 years old = 20 – 6 = 14 years
Select the combination of numbers that when placed sequentially in the blanks of the given series will complete the series.
r s _ u _ w x _ z _ s...
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Which two signs should we interchange inorder to make the given equation true?
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If '+' means '-', ' X ' means '+', '-' means '÷' and '÷' means ' X ', then what is the value of the following expression?
91 - 7 X 18 ÷ 5 + 10...
Statements:
A < B ≥ C > U = W; R < Q > L ≤ W = Y; Q > P
Conclusions:
I. B < P
II. C > R
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Which two signs should be interchanged in the following equation to make it correct:
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If ‘@’ means (×), ‘$’ means (-), ‘#’ means (÷), and ‘%’ means (+), then what is the value of the expression:
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Select the correct combination of mathematical signs that can sequentially replace ‘*’ sign and balance the equation given below.
66 * 32 * 8...
