Interchange the symbols -and x; and the numbers 15 and 18. Find the correct alternative.

(20 x 10) + 15 = 25

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(25 - 3) + 18 = 93

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(40

\div

4) - 18 = 180

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(64 x 10)

\div

15 = 3

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Solution

The correct option is C (64 x 10) $\div$ 15 = 3
Check every alternative.
1. (20 x 10) + 15 = 25.
After interchanging symbols and numbers as suggested in the question, the equation becomes
(20 - 10) + 18 = 25.
LHS = (20 - 10) + 18 = 10 + 18 = 28 $\neq$ 25.
So, this option does not hold good.
2. (25 - 3) + 18 = 93.
After interchanging symbols and numbers as suggested in the question, the equation becomes
(25 x 3) + 15 = 93
LHS = (25 x 3) + 15 = 75 + 15 = 90 $\neq$ 93
So, this option also does not hold good.
3. (40 $\div$ 4) - 18 = 180.
After interchanging symbols and numbers as suggested in the question, the equation becomes
(40 $\div$ 4) x 15 = 180
LHS = (40 $\div$ 4) x 15 = 10 x 15 = 150 $\neq$ 180.
So, this option also does not hold good.
4. (64 x 10) $\div$ 15 =3.
After interchanging symbols and numbers as suggested in the question, the equation becomes
(64 -10) $\div$ 18 = 3.
LHS = (64 - 10) $\div$ 18 = 54 $\div$ 18 = 3 = RHS
So, this option is correct.

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Solve: $20$ of $14 \times 15 \div 18 + 10 - 15$

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$\begin{matrix} X & 10 & 20 & 35 & 14 & 18 & 21 & 16 Y & 15 & 25 & 18 & 19 & 20 & 26 & 27 \end{matrix}$

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