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$18÷6-27+3\times 12$

After interchanging the signs, according to the question,

$18\times 6+27÷3-12$

 $=108+9-12$

$=117-12$

$=105$

Hence, option (2) is the correct answer.

विकल्प (2) से,

$18÷6-27+3\times 12$
प्रश्न के अनुसार चिन्हों को आपस में बदलने के बाद,

$18\times 6+27÷3-12$

$=108+9-12$

$=117-12$

$=105$

अतः विकल्प (2) सही उत्तर है।

from option (4),
$14+4÷5-18\times 2=25$
After interchanging the signs according to the question
$\begin{array}{rl}& 14+4\times 5-18÷2=25\\ & 14+20-9=25\\ & 34-9=25\\ & 25=25\\ & LHS=RHS\end{array}$
Hence, option (4) is the correct answer.

विकल्प (4) से,

$14+4÷5-18\times 2=25$
प्रश्न के अनुसार चिन्हों को आपस में बदलने के बाद
$14+4\times 5-18÷2=25$
$14+20-9=25$
$34-9=25$
$25=25$
बायां पक्ष = दायां पक्ष
अतः विकल्प (4) सही उत्तर है।

from option (2),

$3\times 2÷2+2-3=3$
After interchanging the signs and numbers according to the question
$\begin{array}{rl}& 2÷3\times 3+3-2=3\\ & 2+3-2=3\\ & 5-2=3\\ & 3=3\\ & LHS=RHS\end{array}$
Hence, option (2) is the correct answer.

from option (3),

$8+12÷9\times 6-4=12÷6\times 8+9-1$
After interchanging the numbers according to the question
$\begin{array}{rl}& 8+6÷9\times 12-4=6÷12\times 8+9-1\\ & 8+8-4=4+9-1\\ & 16-4=13-1\\ & 12=12\\ & \text{ LHS }=\text{ RHS }\end{array}$
Hence, option (3) is the correct answer.

from option (3),

$18-8÷12\times 6+10=12$
after interchanging the signs and numbers according to the question
$\begin{array}{rl}& 18+6÷12\times 8-10=12\\ & 18+4-10=12\\ & 22-10=12\\ & 12=12\\ & \text{ LHS }=\text{ RHS }\end{array}$
Hence, option (3) is the correct answer.

from option (4),

$\begin{array}{rl}& 9+12÷6\times 8-4=14\\ & \text{ after interchanging the signs according to the question }\\ & 9+12\times 6÷8-4=14\\ & 9+12\times 0.75-4=14\\ & 9+9-4=14\\ & 18-4=14\\ & 14=14\\ & \text{ LHS }=\text{ RHS }\end{array}$
Hence, option (4) is the correct answer.

from option (3),

$10-15\times 9+6÷3=9$
after interchanging the signs according to the question
$\begin{array}{rl}& 10÷15\times 9+6-3=9\\ & 6+6-3=9\\ & 12-3=9\\ & 9=9\\ & \text{ LHS }=\text{ RHS }\end{array}$
Hence, option (3) is the correct answer.

from option (1),

$12\times 18÷3-6+4=5$
after interchanging the signs and numbers according to the question
$\begin{array}{rl}& 12÷18\times 6-3+4=5\\ & 4-3+4=5\\ & 5=5\\ & \text{ LHS }=\text{ RHS }\end{array}$
Hence, option (1) is the answer.

from option (3),

$4\times 2-8+9÷3=9÷3+4\times 2-8$
after interchanging the numbers according to the question
$\begin{array}{rl}& 4\times 2-3+9÷8=9÷8+4\times 2-3\\ & 4\times 2-3+1.125=1.125+8-3\\ & 8+1.125-3=9.125-3\\ & 6.125=6.125\\ & LHS=RHS\end{array}$
Hence, option (3) is the correct answer.

Given
$18+12\times 8-6÷3=9$
After interchanging the signs according to option (4)
$\begin{array}{rl}& 18÷12\times 8-6+3=9\\ & 12-6+3=9\\ & 15-6=9\\ & 9=9\\ & LHS=\text{ RHS }\end{array}$
Hence, option (4) is the correct answer.

$12÷4+2-6\times 3=3÷12+6\times 2-4$

From option (2),after interchanging the signs and numbers,
$\begin{array}{rl}& 12+6÷2-4\times 3=3+12÷4\times 2-6\\ & 12+3-12=3+6-6\\ & 15-12=9-6\\ & 3=3\\ & \text{ LHS=RHS }\end{array}$
Hence, option (2) is the correct answer.

$9+4÷2-6\times 3=4÷3\times 6-9+1$
From option (4), after interchanging the numbers,
$\begin{array}{rl}& 9+6÷2-4\times 3=6÷3\times 4-9+1\\ & 9+3-12=8-9+1\\ & 12-12=9-9\\ & 0=0\\ & \text{ LHS }=\text{ RHS }\end{array}$
Hence, option (4) is the correct answer.

From option (3),

$6\times 3-8÷2+5=8÷2+3\times 5-6$
After interchanging the numbers according to question
$\begin{array}{rl}& 5\times 3-8÷2+6=8÷2+3\times 6-5\\ & 15-4+6=4+18-5\\ & 21-4=22-5\\ & 17=17\\ & \text{ LHS }=\text{ RHS }\end{array}$
Hence, option (3) is the correct answer.

From option (3),

$8÷2-6\times 4+3=13$
after interchanging the signs and numbers according to the Question
$\begin{array}{rl}& 6\times 2-8÷4+3=13\\ & 12-2+3=13\\ & 15-2=13\\ & 13=13\\ & \text{ LHS }=\text{ RHS }\end{array}$
Hence, option (3) is the correct answer.

From option (2),

$4+8\times 12÷6-4=8$
After interchanging the sign according to the question
$\begin{array}{rl}& 4÷8\times 12+6-4=8\\ & 0.5\times 12+6-4=8\\ & 6+6-4=8\\ & 12-4=8\\ & 8=8\\ & \text{ LHS }=\text{ RHS }\end{array}$
Hence, option (2) is the correct answer.

Has given-
$625\times 5+93-22÷8=42$
On interchanging the signs $\times$ and $÷$ in the above expression
$\begin{array}{rl}& 625÷5+93-22\times 8\\ & =125+93-176\\ & =218-176\\ & =42\end{array}$
Hence, option (2) is the correct answer

 given,
$a\Rightarrow$ $\times$
$b\Rightarrow$ $÷$
$c\Rightarrow$ -
$d\Rightarrow$ +
Substituting the values of a, b, c, and d in the expression 55 a 5b5 c 5d 3
$55\times 5÷5-5+3$
$\begin{array}{rl}& 55\times 1-5+3\\ & 55+3-5\\ & 58-5=53\end{array}$
Hence, option (1) is the correct answer.

Has given-

$42÷23+870\times 3-5=541$

On interchanging the signs $÷$ and $-$ in the above equation 

$\begin{array}{rl}& 42-23+870\times 3÷5\\ & =42-23+522\\ & =541\end{array}$

Hence, option (2) is the correct answer.

$\mathrm{P}=$ subtraction $(-)$

$\mathrm{Q}=$ division $(÷)$

$\mathrm{R}=$ addition $(+)$

$\mathrm{S}=$ multiplication $(\times )$

106 R 115 Q 23 S 7 P 19
converting to symbols

$106+115÷23\times 7-19$
$=106+5\times 7-19$
$=106+35-19$
$=141-19=122$
Hence, option (2) is the correct answer.

Given,

426 ÷648-312

If signs ' ÷ ' and '-' are interchanged and the digits ' 2 ' and ' 4 ' are interchanged then 

246-628÷314

= 246- 2

=244

Hence, option (4) is the correct answer.