Question
Out of four numbers, the average of the first three is
16 and that of the last three is 14. If the last number is 17, then find the first number?Solution
Let the four numbers be a, b , c and d. (a + b + c)/3 = 16 (a + b + c) = 48 ----- (i) (b + c + d)/3 = 14 (b + c + d) = 42 ----- (ii) Given that last number is 17 i.e. , d = 17, now putting this value in (ii) (b + c +17) = 42 (b + c) = 42-17 (b + c) = 25 ----- (iii) Now, putting value of (iii) into (i), (a + b + c) = 48 a + 25 = 48 a = 48-25 = 23 therefore, the first number is 23.
Who purchased the bungalow 18 years ago?
How many floors are there above G’s floor?
Achillea was exhibited by which state?
Which one of the following lives on floor number Six?
Seven persons S, T, U, V, W, X and Y live on different floor of a seven-storey building. The bottommost floor is numbered as 1 and the topmost floor is...
Which of the following is correct with respect to the given puzzle?
In a code language, ERRORS is written as '6’ and LIGHTS is written as '9'. How will CONGRATS be written in that language?
In the following letter set, the second letter set is related to the first letter set in a certain way, find the letter set from the options which is r...
There are five sweets (Rasgulla, Petha, Peda, Jalebi and Rasmalai) kept in five boxes. Each box is assigned a number from 1 to 5, where the bottommost b...
Who among the following person(s) is/are living between Pooja and Naman?
(i) Ritu
(ii) Neelam
(iii) Ankit
Relevant for Exams:
