Question
The average of 15 numbers is 84. The first seven numbers
and the last five numbers have averages of 92.5 and 72.5, respectively. The ninth number exceeds the eighth number by 20%, and the tenth number is reduced by (50/9)% from the ninth number. Determine the value of the ninth number.Solution
Let eighth number is 10x So, ninth number = 1.20 × 10x = 12x Tenth number = 850/9 × 1/100 × 12x = 34x/3 So, 10x + 12x + 34x/3 = 84 × 15 – 7 × 92.5 – 5 × 72.5 = 250 Or, 100x/3 = 250 Or, x = 7.5 So, ninth number = 12 × 7.5 = 90
If P is related to Kanpur, S is related to Jaipur in the given arrangement, Following the same pattern how is U related to ?
Who among the following person likes Red?
Six people, D, E, F, G, H and I, sit in a linear row, such that all face in the north direction. Only two persons sit to the right of E. F sits second t...
A-W, B-X, C-Y and D-Z are four married couples. In a restaurant they are sitting around a rectangular table, with three persons along each of the longer...
Which of the following is R’s position?
Four of the five are related to each other in a certain way and thus form a group, find the odd one out which doesn’t belong to the group?
...Refer to the following letter sequence and answer the question given below:
 Left) P, T, S, A, Q, R, G, P, Q, N, D, F, L, H, R, F, A, N  (Ri...
What is difference between weight of I and L?
Who among the following person sits second to the left of the one whofacing O?
Which of the following is true for F?
Relevant for Exams:
