Methods of Solving Mathematical Operations

If the ratio of sum and difference of two numbers is $7 : 1$, then the ratio of these two numbers is

If $\text{'}?\text{'}$ means $\text{'}\times \text{'}, \text{'}\$\text{'}$ means $\text{'}+\text{'}, \text{'}\#\text{'}$ means $\text{'}÷\text{'}$ and $\text{'}\copyright \text{'}$ means $\text{'}-\text{'}$ then find the value of 

$360\#24\$56\$5\copyright 25?2$

$\mathrm{If} 6\frac{1}{\mathrm{x}}\times \frac{4}{5}=5, \mathrm{x}=?$

If '$=$', stands for '$+$', '$+$', stands for '$-$', '$<$', for '$>$', '$/$', stands for '$=$', '$-$', stands for '$/$', '$\times$', stands for '$<$', and '$>$', stands for '$\times$'. Then find out the correct item among the following.

Which one set of letters when sequentially placed at the gaps will complete the given letter series?

If $\mathrm{A}$ represents '$\times$', $\mathrm{B}$ represents '$÷$', $\mathrm{C}$ represents '$+$' and $\mathrm{D}$ represents '$-$', then find the value of $2 \mathrm{A} 8 \mathrm{D} 5 \mathrm{C} 9 \mathrm{B} 3$?

If $?$ means $\times$, $\$$ means $+$, $\text{'}\# \text{'}$ means $-$ and $\copyright$ means $-$, then find the value of:

$36 \# 24 \$ 56 \$ 5 \copyright 25?2$

If the given interchanges are made in signs and numbers, which one of the four equations would be correct

Given interchanges signs $+$ and$\times$  numbers $3$ and $7$.

If '$+$', means 'multiplied by', '$-$', means 'divided by', '$\times$', means 'subtracted to' and '$÷$', means 'added to' then what is the value of following equation$?$

 $20 + 80 - 20 ÷ 10 \times 48$

Some questions are solved on the basis of a certain system on the same basis find out the correct answer from amongst the four alternatives for the unsolved equations in each question.

if

$$\begin{gathered} 0 1 2 4=9 \\ 1 2 3 4=15 \\ 2 3 4 5=25 \end{gathered}$$

then $3 4 5 6=?$

If N means '/', S means '+', R means '-' and I means 'x' then

$420 \mathrm{N} 100 \mathrm{R} 10 \mathrm{I} 80 \mathrm{S} 14 =?$

If '$÷$' means '$+$'; '$\times$' means '$-$', '$+$' means '$\times$' and '$-$' means '$÷$', then

$455-5÷15\times 32+13 = ?$

The position of the first and last digits are interchanged and two is subtracted from the middle digit of each the following numbers. If the numbers are arranged in descending order then which of the following would be the last but one number ?

$326 247 379 763 476$

Which of the following interchange of signs would make the given equation correct?

$(12 ÷ 6) + 3 \times 7 = 42$

One nautical mile is equal to-

If  '$+$', means '$\times$', '$÷$', means '$-$', '$-$', means '$÷$', '$\times$', means '$+$', then what is the value of the following expression $15 + 5 ÷ 9 - 3 \times 6$$?$

If a means 'plus' b means 'minus', c means 'multiplied by' and d means 'divided by', than $18 \mathrm{c} 14 \mathrm{a} 6 \mathrm{b} 16 \mathrm{d} 4 = ?$

If $\text{'}÷\text{'}$ means $\text{'}+\text{'}, \text{'}\times \text{'}$ means $\text{'}-\text{'}, \text{'}+\text{'}$ means $\text{'}\times \text{'} \mathrm{and} \text{'}-\text{'}$ means $\text{'}÷\text{'},$ then $18-3÷6 \times 12+15=?$

If '$\mathrm{K}$' means '$÷$', '$\mathrm{L}$' means '$-$', '$\mathrm{M}$' means '$\times$' and '$\mathrm{N}$' means '$+$', what will be the result of $18 \mathrm{N} 3 \mathrm{M} 4 \mathrm{L} 36 \mathrm{K} 9=?$

Which of the following interchange of signs would make the given equation correct?

$5 + 3 \times 8 - 12 ÷ 4 = 3$

Select the correct combination of mathematical signs to replace $*$ signs and the given equation will be balance ?

$40 * 17 * 36 * 49 * 7 * 3$