Question
The average number of novels on historical, thriller and
fantasy in a library is 120, and the average number of novels on historical and fantasy is 110. If the number novels on fantasy is 15% less than the number of novels on thriller, then what is the number of novels on historical in the library?Solution
Let the number of novels on historical, thriller and fantasy be x, y and z respectively. Given, (x + y + z)/3 = 120 => x + y + z = 360 ….. (1) And, (x + z)/2 = 110 => x + z = 220 ….. (2) From equation 1 and 2 Number of novels on thriller = y = 140 Number of novels on fantasy = 0.85 × 140 = 119 Therefore, number of novels on historical = 360 – (140 + 119) = 101
If all the numbers are arranged in descending order from right to left, which of the following will be the product of the all three digits of the number...
Select the option in which the numbers are related in the same way as the numbers of the following set.
(25, 18, 225)
64 8 5
420 14 10
What the difference between the resultant of the first row and the second row?
...Solve: 7 + 3 × 6 ÷ 2 = ?
Find the number which does NOT belong to the group : 101, 242, 363, 484
A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
13, 38, 150, _____, 4478, 31341.
87 25 36
44 22 13
What is the sum of the resultants of the two rows?
...Read the directions carefully and answer the following question.
Select the correct combination of mathematical signs that can sequentially rep...
If 2 is added to all the odd place digits and 1 is subtracted from all even place digits (from the left end) in ‘634715247’ and then all the digits ...
