In a class of 20 students in an examination in Mathematics 2 students scored 100 marks each, 3 got zero each and the average of the rest was 40. What is average of the whole class ?
A boy was asked to multiply a given number by 8/17. Instead, the divided the given number by 8/17 and got the 225 more than what he should have got if he had multiplied the number by 8/17. The given number was
Two or more essences out of a stock five essences-- L, M, N, O, and P are used in making all perfumes by a manufacturer. He has learned that for a blend of essences to be agreeable it should comply with all the rules listed below.
A perfume containing L, should also contain the essence N, and the quantity of N should be twice as that of L.
A perfume containing M, must also have O as one of its components and they should be in equal proportion.
A single perfume should never contain N as well as O.
O and P should not be used together.
A perfume containing the essence P should contain P in such a proportion that the total amount of P present should be greater than the total amount of the other essence or essences used.
Among the below mentioned formulas, which can be made agreeable by the eliminating some or all of one essence ?