Question
There are 15 numbers such that average of first 12
numbers is 30 while the average of last five numbers is 50. Find the 12th number, if the ratio between 11th and 12th number is 6:5, respectively.Solution
Sum of first 12 numbers = (12 x 30) = 360 Sum of last 5 numbers = (50 x 5) = 250 Sum of 11th and 12th number = (360 - 250) = 110 So, 12th number = 110 x (5/11) = 50
Select the correct combination of mathematical signs to sequentially replace the * signs and balance the given equation.
[(345 + 255) ÷ 30 X 12 ...
If ‘A’ means (÷), ‘B’ means (×), ‘C’ means (+), and ‘D’ means (-), then ____ is the value of the expression.
25 A 5 B 8 D 6 C 4...
If ‘L’ denotes ‘addition’, ‘M’ denotes ‘multiplication’, ‘N’ denotes ‘subtraction’, ‘P’ denotes ‘division’, then what wi...
Select the correct combination of mathematical signs that can sequentially replace '*' sign and balance the equation given below.
172 * 224 * 8 *...
What will be the value of the given expression after the following interchanges?
Expression: 84 ÷ 11 - 15 X 14 + 75
Interchanges: Sign: '...
In a certain code of language, ‘+’ represents ‘x’, ‘-‘ represents ‘+’, ‘x’ represents ‘÷’ and ‘÷’ represents ‘-‘ what ...
If “+” means “minus”, “×” means “divided by”, “÷” means “plus”, and “-“ means then “multiplied by”
260 × 13 �...
If '+' means '-', ' X ' means '+', '-' means '÷' and '÷' means ' X ', then what is the value of the following expression?
91 - 7 X 18 ÷ 5 + 10...
Statements:
A < B ≥ C > U = W; R < Q > L ≤ W = Y; Q > P
Conclusions:
I. B < P
II. C > R
Select the correct sequence of mathematical signs that can sequentially replace the ‘#’ signs and balance the given equation.
56 # 8 # 4 # 32...
