4
Q:

# In an NGO the daily average wages of 20 illiterate employees is decreased from Rs.25 to Rs.10, thus the average salary of  all the literate and illiterate  employees is decreased Rs.10 per day. The No. of educated employees working in the NGO is :

 A) 15 B) 20 C) 10 D) Data Insufficient

Explanation:

Total employees = $\inline&space;\frac{(25-10)\times&space;20}{10}=30$

Hence number of educated employees  = 30-20 = 10

Q:

The average weight of a group of boys is 30 kg. After a boy of weight 35 kg joins the group, the average weight of the group goes up by 1 kg. Find the number of boys in the group originally ?

 A) 6 B) 8 C) 4 D) 5

Explanation:

Let the number of boys in the group originally be x.
Total weight of the boys = 30x
After the boy weighing 35 kg joins the group, total weight of boys = 30x + 35
So 30x + 35 + 31(x + 1) = > x = 4.

0 8
Q:

The average age of the district level hockey team of eleven is 22 years.The average age gets increased by 1 year when the coach age is also included.what is the age of the coach ?

 A) 33 yrs B) 34 yrs C) 35 yrs D) 36 yrs

Answer & Explanation Answer: B) 34 yrs

Explanation:

Total age of players in team = 22 x 11 = 242
When coach is included, total members = 12, Avg age increases by one becomes 23
Total age when coach is included = 23x12 = 276
Age of coach = 276-242 = 34 yrs.

3 126
Q:

In a cinema hall for the matinee show which started at 2.30 pm and ended at 5.30 pm the vehicle parking lot had only three wheelers (auto rickshaws) and four wheelers. Today the wheels of the vehicles parked was counted and found to be 240. What could be the number of three wheelers parked therein ?

 A) 48 B) 41 C) 45 D) 43

Explanation:

3X + 4y = 240
by substitute through options 48 is correct

3 189
Q:

The average of a non-zero number and its square is 11 times the number. The number is ?

 A) 22 B) 21 C) 11 D) 17

Explanation:

Let the number be 'x'.

$\inline \fn_jvn \small \frac{x+x^{2}}{2}$ = 11x
$\fn_jvn \small x^{2}$= 22x
=> x = 22.

2 202
Q:

The ratio of speeds of a car, a train and a bus is 5:9:4. The average speed of the car, the bus and the train is 72 km/hr together. What is the average speed of the car and the train together ?

 A) 84 km/hr B) 96 km/hr C) 72 km/hr D) 60 km/hr

Answer & Explanation Answer: A) 84 km/hr

Explanation:

Let the speeds of the car, train and bus be 5x, 9x and 4x km/hr respectively.
Average speed = 5x + 9x + 4x/3 = 18x /3 = 6x km/hr.
Also, 6x = 72 => x = 12 km/hr
Therefore, the average speed of the car and train together is = $\inline \fn_jvn \small \frac{5x+9x}{2}$= 7x = 7 x 12 = 84 km/hr.