Question
The average number of books on history, polity and
geography in a library is 140, and the average number of books on history and geography is 150. If the number books on geography is 20% less than the number of books on polity, then what is the number of books on history in the library?Solution
Let the number of books on History, Polity and Geography be x, y and z respectively. Given, (x + y + z)/3 = 140 Or, x + y + z = 280 ….. (1) And, (x + z)/2 = 150 Or, x + z = 300 ….. (2) From equation 1 and 2 Number of books on polity = y = 120 Number of books on geography = 0.8 × 120 = 96 Therefore, number of books on history = 420 – (120 + 96) = 204
In a certain code language, ‘CROSS’ is written as ‘66’ and ‘CHART’ is written as ‘90’. How will ‘SYMBOL’ be written in that language...
In a group of five children (K, L, O, M, N) with different heights. K is the tallest while L. is the shortest. O is the second shortest person in that g...
Three of the following four number-pairs are alike in a certain way and thus form a group. Which is the pair that does not belong to that group?
...
What should come in place of the question mark (?) in the given series based on the English alphabetical order?
DHC, GKF, JNI, MQL, ?
Take the given statements as true, disregarding commonly known facts, and decide which of the conclusion(s) logically follow(s) from the statements.
...How many different words, with or without meaning, can be formed by using the letter of the word COVID?
Select the option that is related to the fifth term in the same way as the second term is related to the first term and the fourth term is related to th...
Select the option figure in which the given figure is embedded (rotation is NOT allowed).
Select the number that does NOT belong to the given number series.
39, 46, 60, 82, 109, 144
If digit 2 is interchanged with digit 1, then what will be the value of the following equation?
9 + 6 ÷ 4 × 21 – 5=?
Relevant for Exams:
