The average salary of the entire staff in the office is Rs. 120 per month. The average salary of officers is Rs. 460 and that of non- officers is Rs. 110. If the number of officers is 15, then find the number of non-officers in the office.

The average salary of the entire staff in the office is Rs. 120 per month. The average salary of officers is Rs. 460 and that of non- officers is Rs. 110. If the number of officers is 15, then find the number of non-officers in the office.

Let number of non-officers = a,

Then Total salary of officers = 15 × 460 = 6900,

Total salary of non-officers = a × 110.

Total salary of all employees = 120 × (15 +a)

Then,

Salary of all employees = Salary of officers + Salary of non-officers

120 × (15 + a) = 15 × 460  +  110a

1800 + 120a = 6900 + 110a

120a – 110a = 6900 – 1800

10a = 5100

a = 510

Hence, number of non-officers = 510

• The ratio of the sum of the salaries of A and B to the difference of their salaries is 11 : 1 and the ratio of the sum of the salaries of B and C to the difference of their salaries is also 11 : 1. If A's salary is the highest and C's is the lowest then w
• There are three taps A, B and C in a tank. They can fill the tank in 25 hrs, 20 hrs and 10 hrs respectively. At first all of them are opened simultaneously. Then after 1 hrs, tap C is closed and tap A and B are kept running. After the 4th hour, tap B is a
• Two types of rice (type 1 and type 2) were mixed in the respective ratio of 1 : 3. The mixture was then sold @ 75.60 per kg to gain a profit of 20%. If the price of type 1 rice is Rs. 75 per kg, what is the price of type 2 price per kg?
• In a hotel, the rooms are numbered from 101 to 130 on the first floor, 221 to 260 on the second floor and 306 to 345 on the third floor. In the month of June this year, the room occupancy was 60% on the first floor, 40% on the second floor and 75% on the
• Nidhi received simple interest off Rs. 1200 when invested Rs x at 6% p.a. and Rs y at 5% p.a. for 1 year. Had she invested Rs. x at 3% p.a. and Rs. y at 8% for that year, she would have received simple interest of Rs 1,260. Find the values Rs. x an y.