Symbols - and - numbers 20 and 15-

The correct option is B (40 + 5) × 15 = 220Given equation (1)(15 ÷ 5) × 6 = 18Thus, after changing nbsp;Symbols × and +; numbers 20 a ...

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Standard XII

Mathematics

Solving a system of linear equation in two variables

Symbols × a...

Question

Symbols $\times$ and +; numbers 20 and 15.

(15

\div

\times

6 = 18

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(20 - 5) + 20 = 30

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(30

\times

15) + 11 = 5

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(40 + 5)

\times

15 = 220

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Solution

The correct option is B (40 + 5) $\times$ 15 = 220
Given equation (1)
(15 $\div$ 5) $\times$ 6 = 18
Thus, after changing Symbols $\times$ and +; numbers 20 and 15, the new equation is:
$(20 \div 5) + 6 = 18$
LHS: $(20 \div 5) + 6 = 4 + 6 = 10$
Hence, $L H S \neq R H S$
Given equation (2)
(20 - 5) + 20 = 30
Thus, after changing Symbols $\times$ and +; numbers 20 and 15, the new equation is:
$(15 - 5) \times 6 = 30$
LHS: $(15 - 5) \times 6 = 10 \times 6 = 60$
Hence, $L H S \neq R H S$
Given equation (3)
(30 $\times$ 15) + 11 = 5
Thus, after changing Symbols $\times$ and +; numbers 20 and 15, the new equation is:
$(30 + 20) \times 11 = 5$
LHS: $(30 + 20) \times 11 = 50 \times 11 = 550$
Hence, $L H S \neq R H S$
Given equation (4)
(40 + 5) $\times$ 15 = 220
Thus, after changing Symbols $\times$ and +; numbers 20 and 15, the new equation is:
$(40 \times 5) + 20 = 220$
LHS: $(40 \times 5) + 20 = 200 + 20 = 220$
Hence, $L H S = R H S$

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Compute the mode from the following data:
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Q. Find the first quartiles for the following data.

8, 11, 20, 10, 2, 17, 15, 5, 16, 15, 25, 6, 5

Q. Find the missing term :

2	10	11	15
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Q. Find the median for the following grouped data.

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Q. If

x < 6

and

17.5

is the mode of the following frequency distribution

Class interval	0-5	5-10	10-15	15-20	20-25
Frequency	5	2	3	6	x

Then

x

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Symbols × and +; numbers 20 and 15.

Symbols $\times$ and +; numbers 20 and 15.