Question
There are 15 numbers such that average of first 12
numbers is 65 while the average of last five numbers is 70. Find the 12th number, if the ratio between 11th and 12th number is 13:7, respectively.Solution
Sum of first 12 numbers = (12 x 65) = 780 Sum of last 5 numbers = (70 x 5) = 350 Sum of 11th and 12th number = (780 - 350) = 430 So, 12th number = 430 x (7/20) = 150.5
Select the correct combination of mathematical signs to replace the '@' signs and balance the given equation.
22 @ 6 @ 18 @ 17 @ 2
If '>' means 'Addition', '$' means 'Divide', '<' means 'Subtract', '%' means Multiply', Then '' 54 > 32 $ 8 < 6 % 5 ' = (?)
Which of the following interchange of sign would make the given equation correct?
45 × 9 + 5 ÷ 4 = 25
If '-' means 'division', '÷' means 'addition', '+' means 'multiplication' and ' X ' means 'subtraction', then what is the value of the following expres...
157 + 256 – 88 ÷ 8 × 4 = 117
If '+' means ' - ', ' X ' means '+', ' - ' means '÷' and '÷' means ' X ', then what is the value of the following expression?
32 ÷ 8 X 117 - 1...
Select the correct combination of mathematical signs that can sequentially replace the ‘*’ signs and balance the given equation.
12 * 8 * 42 ...
Which two signs should be interchanged to make the given equation correct?
8 – 42 + 15 × 20 ÷ 4 = 346
If ‘P’ means ‘+’, V means ‘×’, T means ‘-‘ and ‘Q’ means “÷’ , then find the value of the expression given below:
30 P ...
Select the correct combination of mathematical signs to replace (#) signs and to balance the given equation.
630 # 15 # 14 # 5 # 24 # 121
