What number should replace the question mark?
4 2 9 8 6
3 8 7 9 5
8 1 7 ? 1

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Solution

The correct option is B 8
Add the top two rows of numbers to obtain the bottom row;
4 2 9 8 6
+ 3 8 7 9 5
--------------------
$=$ 8 1 7 8 1
Thus the number that replaces the question mark is $8$
Hence, option B is correct.

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Similar questions

Q. Study the following number line and answer the questions that follow.
2 5 9 1 7 2 5 1 9 7 3 9 5 2 4 6 8 1 9 7 5 2 7 3 1 9 7 8 5 2 6 5 4 1 9 7 8 2 0 1 0 9 7 8 5 1 9 7 3 5 1 6 9 7 2 1 7 3 7 9 5 1

How many times is number '3' preceded by number '7' and not followed by an even number?

Q. Study the following number line and answer the questions that follow.
2 5 9 1 7 2 5 1 9 7 3 9 5 2 4 6 8 1 9 7 5 2 7 3 1 9 7 8 5 2 6 5 4 1 9 7 8 2 0 1 0 9 7 8 5 1 9 7 3 5 1 6 9 7 2 1 7 3 7 9 5 1

How many times is number 5 followed by 1 or 2, but not preceded by 8 ?

Q. What number should replace the question mark?
5, 12, 7, 15, 8, 18, 10, ?

Question 18
Which of the following is not true?
(A) $(7 + 8) + 9 = 7 + (8 + 9)$
(B) $(7 \times 8) \times 9 = 7 \times (8 \times 9)$
(C) $7 + 8 \times 9 = (7 + 8) \times (7 + 9)$
(D) $7 \times (8 + 9) = (7 \times 8) + (7 \times 9)$

Q. Replace

by the correct number in each of the following:
(i)

\frac{2}{7} = \frac{8}{}

(ii)

\frac{3}{5} = \frac{}{35}

(iii)

\frac{5}{8} = \frac{20}{}

(iv)

\frac{45}{60} = \frac{9}{}

(v)

\frac{40}{56} = \frac{}{7}

(vi)

\frac{42}{54} = \frac{7}{}

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What number should replace the question mark?4 2 9 8 63 8 7 9 58 1 7 ? 1

The correct option is B 8Add the top two rows of numbers to obtain the bottom row; 4 2 9 8 6 + 3 8 7 9 5--------------------= 8 1 7 8 1 Thus the number that replaces the question mark is 8Hence, option B is correct.

What number should replace the question mark?
4 2 9 8 6
3 8 7 9 5
8 1 7 ? 1

The correct option is B 8
Add the top two rows of numbers to obtain the bottom row;
4 2 9 8 6
+ 3 8 7 9 5
--------------------
$=$ 8 1 7 8 1
Thus the number that replaces the question mark is $8$
Hence, option B is correct.