Given:
The average age of a man and his son is 45 years
The ratio of their ages is 2:1
Solution:
Let the ratio of their ages be 2x,1x
Total sum of the ages of man and his son = 2×45 = 90 years
2x+x = 90
3x=90
x=30
Man’s age =2x = 2×30 = 60
Son’s age =x= 30 years
English
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12 Mins English English50 Questions100 Marks60 Mins English English10 Questions20 Marks12 Mins EnglishFor different sets of datasets X and Y. correlation coefficient between X and Y, that is R and standard deviation of X and Y, that is, S(X) and S(Y) are given in A-D below. Estimate the covariance between X and Y for each dataset and arrange in ascending order.
A. R= 0.5, S(X)= 8, S(Y)= 10
B. R= 4/7, S(X)= 7, S(Y)= 9
C. R= 0.7, S(X)= 12, S(Y)= 5
D. R= 19/42, S(X)= 14, S(Y)= 6
Choose the correct answer from the options given below:
Arrange the following fractions in increasing order:
A.
B.
C.
D.
Choose the most appropriate answer from the options given below:
If is the mean of , then for , the mean of , , , ,....) is:
Two successive discounts of 10% and 15% are equivalent to a single discount of:
A man gets an annual pay of Rs 9.0 lakh. His expenditure and savings are in the ratio 5:1. What is his average savings per month?
Suppose a man swims 12 km upstream and 20 km downstream in a river in 4 hours. If he swims 18 km upstream and 10 km downstream also in 4 hours, then the speed at which he swims in the still water is.
The liquids A and B are in the ratio 5 : 1 in container 1 and 1 : 3 in container 2. In what ratio should the contents of the two containers be mixed so as to obtain a mixture of A and B in the ratio 1 : 1?
Six numbers a, b, c, d, e, f are such that ab = 1, bc = 1/2, cd = 6, de = 2, and ef = 1/2. What is the value of (ad : be : cf)?
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