The average age of three boys is 25 years and their ages are in the proportion 3:5 :7. The age of the youngest boy is
12 years
8 years
15years
none of these
162.
if 0.4 of a number is equal to 0.06 of another number, then the ratio of the numbers is
3:2
3:4
3:20
20:3
163.
If 0.4: 1.4:: 1.4: x, the value of x is:
49
0.49
4.9
0.4
164.
If 15% of x is the same as 20% of y, then x: y is
3:4
4:3
17:16
16:17
165.
Which of the following ratios is the largest?
7 ;15
15 :23
17:25
21:29
166.
The ratio of the age of a man and his wife is 4: 3. After 4 year this ratio will be 9: 7. If at the time of the marriage, the ratio was 5:3, then how many years ago they were married?
12
8 years
10 years
15 years
167.
The volume of a cupboard with a base area of 96c * m ^ 2 and height of 4 cm is:
412cm ^ 3
384cm ^ 3
48cm ^ 3
96cm ^ 3
168.
Pointing to a man, a woman said, "His mother is the only daughter of my mother. How is the woman related to the man:
MOTHER
SON
FATHER
DAUGHTER
169.
What is the average of 1/2, 5/6, 3/4, 5/12
1/6
2/3
5/8
4/7
170.
In the exam 45% students failed and 550 students were successful. The total number of students who appeared in the exam was: