Out of four numbers, the average of the first three is 15 and that of the last three is 16. If the last number is 19, the first is

Parvesh Kanani • 2.84K Points
Extraordinary Math

Q. Out of four numbers, the average of the first three is 15 and that of the last three is 16. If the last number is 19, the first is

(A) 19

(B) 15

(D) 18

Correct Answer - Option(C)

Explanation by: Parvesh Kanani

Given , Sum of first 3 numbers = 15 × 3 = 45
⇒ a + b + c = 45 ,
last number = d = 19
and Sum of the last three numbers = 16 × 3 = 48
⇒ b + c + d = 48
⇒ b + c = 48 – 19 = 29
∴ a + b + c = 45
⇒ a = 45 – 29 = 16

You must be Logged in to update hint/solution

Previous MCQ Next MCQ

Discusssion

Related MCQs on Math

Q. A and B cracked a deal to complete a work in Rs. 4,500. A alone can complete this work in 8 days, wh...

Q. The length of a rectangle is twice its breadth if its length is decreased by 5cm and breadth is incr...

Q. The difference between a discount of 40% on ₹ 500 and two successive discounts of 36% and 4% on th...

Q. The perimeter of a rhombus is 40 m and its height is 5 m. Its area is

Q. The area of a triangle whose sides are of lengths 3 cm, 4 cm and 5 cm is

Q. A trader makes a profit equal to the selling price of 75 articles when he sold 100 of the articles. ...

Q. The two numbers are in the ratio of 2 : 3 and the product of their HCF and LCM is 33750 , then sum o...

Q. The total number of 3 digit numbers which have two or more consecutive digits identical is

Q. The compound interest on Rs. 6000 at 10% per annum for 1.5 years, when the interest being compounded...

Q. Twenty-nine times the area of a square is one square metre less than six times the area of the secon...

Learn All Math MCQs

Download our easy to use, user friendly Android App from Play Store. And learn MCQs with one click.