In the Board exams, the average marks scored by 20 students is 55. But while calculating, marks of 2 students were wrongly entered as 43 and 60 in place of 54 and 45. Then, what will be the correct average marks of the 20 students.
ATQ, Total marks which are (incorrect) in Board exam are = 55 × 20 = 1100 Now, the correct total marks will be = 1100 + (54 + 45) – (43 + 60) = 1096 Correct average marks = (1096/20) = = 54.8
If '+' means '-', ' X ' means '+', '-' means '÷' and '÷' means ' X ', then what is the value of the following expression?
91 - 7 X 18 ÷ 5 + 10...
Which two signs should be interchanged to make the following equation correct?
52 – 27 ÷ 9 + 7 × 5 = 20
Which of the following “signs” are placed in place of “symbols” given in the equation to make the equation true?
36 $ 12 % 6 + 8 – 9 @ ...
Select the correct combination of mathematical signs that can sequentially replace the * signs and balance the given equation.
364 * 4 * 7 * 4 * 12 = 75
Which one of the following equations is correct, If ‘-’ stands for ‘division’, ‘+’ for ‘multiplication’, ‘÷’ for ‘subtraction’ ...
If,
40 – 14 means 560,
168 + 8 means 21,
26 ÷ 2 means 28,
8 x 7 means 1,
then 410 – 7 x 290 ÷ 350 + 7 x 21 = ?
Which two signs should be interchanged to make the following equation correct?
5 × 8 ÷ 2 – 4 = 30 + 6
Select the correct combination of mathematical signs that can sequentially replace the * signs and balance the given equation.
56 * 492 * 6 * 7 * 123 = 507
Study the given pattern carefully and select the number that can replace the question mark (?) in it.
4 7 6
15 ? 21
44 68 60
In an imaginary mathematical system, symbol '–' stands for addition, symbol '+' stands for division, symbol '×' stands for subtraction, and symbol '...
