Question
In a group of three numbers first is double of second
and half of third. The average of three numbers is 42. Find the difference between the first number and third number?Solution
Let the first number be ‘x’ Second number = x/2 Third number = 2x According to the question, (x+x/2+2x)/3 = 42 (2x+x+4x)/6 = 42 7x = 42 × 6 x = 36 ∴ Required difference = 72 - 36 = 36
Select the correct combination of mathematical signs that can sequentially replace ‘*’ sign and balance the equation given below.
82 * 28 * 7...
If x stands for ‘addition’, ÷ stands for ‘subtraction’, + stands for ‘multiplication’, and – stands for ‘division’, then 80 x 54 –...
If '+' means '-', ' X ' means '+', '-' means '÷' and '÷' means ' X ', then what is the value of the following expression?
912 - 8 + 211 X 14 ÷...
Select the correct combination of mathematical signs to replace the * signs and balance the given equation.
5 * 15 * 320 * 2 * 45 = 190
If 236 = 33, 487 = 57, 6391 = 57, then 851 = ?
Select the correct combination of mathematical signs to replace the '@' signs and balance the given equation.
22 @ 6 @ 18 @ 17 @ 2
- Which two signs are to be interchanged to make the given equation correct?
132 + 14 ÷ 11 - 84 X 72 = 156 Select the correct combination of mathematical signs that can sequentially replace ‘*’ sign and balance the equation given below.
42 * 18 ...
If ‘÷’ means ‘addition’, ‘+’ means ‘subtraction’, ‘-’ means ‘multiplication’, and ‘x’ means ‘division’, what will be th...
Which two digits and signs can be interchanged so as to balance the given equation?
406- 102 + 128 X 5 ÷ 58 = 545
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