# The average age of 30 boys in a class is 15 years. One boy, aged 20 years, left the class, but two new boys came in his place whose ages differ by 5 years. If the average age of all the boys now in the class becomes 15 years, the age of the younger newcomer is:

1.  20 years

2.  15 years

3.  10 years

4.  8 years

4

15 years

Explanation :
No Explanation available for this question

# Out of three numbers, the first is twice the second and is half of the third. If the average of the three numbers is 56, then difference of first and third numbers is :

1.  12

2.  20

3.  24

4.  48

4

48

Explanation :
No Explanation available for this question

# Which of the following numbers is the least

1.  (0.5)2

2.  √0.49

3.  3√0.008

4.  0.23

4

3√0.008

Explanation :
No Explanation available for this question

# If O is the centre of the circle, then V is:

1.  720

2.  620

3.  820

4.  520

4

820

Explanation :
No Explanation available for this question

# sin25° + sin210° + sin2l5° + .... +sin285° + sin290 is equal to

1.  7

2.  8

3.  9

4.  9

4

9

Explanation :
No Explanation available for this question

# If andand x> 1,then the value ofis

1.  54

2.  18

3.  72

4.  36

4

36

Explanation :
No Explanation available for this question

# If,then numerical value of xy is:

1.  4/3

2.  3/4

3.  1/4

4.  1/3

4

4/3

Explanation :
No Explanation available for this question

# The in-radius of an equilateral triangle is of length 3 cm.Then the length of each of its medians is:

1.  12 cm

2.  9/2 cm

3.  4 cm

4.  9 cm

4

9 cm

Explanation :
No Explanation available for this question

# The base radii of two cylinders are in the ratio 2 : 3 and their heights are in the ratio 5:3. The ratio of their volumes is:

1.  27 : 20

2.  20 : 27

3.   9 :4

4.  4:9

4

20 : 27

Explanation :
No Explanation available for this question

1.  1: √2

2.  √2 :1

3.  1 : 2

4.  2 : 1

4