If +42 represents 42 m above the water surface, what does each of the following represent: [4 MARKS]

(i) -87+55

(ii) +98-115

(ii) +36+57-73

(iv) -42-23+39

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Solution

Each point: 1 Mark

(i) -87+55 = -32
$\Rightarrow$ 32 m below the water surface

(ii) +98-115 = -17
$\Rightarrow$ 17 m below the water surface

(ii) +36+57-73 = 20
$\Rightarrow$ 20 m above the water surface

(iv) -42-23+39 = -26
$\Rightarrow$ 26 m below the water surface

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Similar questions

If $+ 42$ represents $42 m$ above the water surface, then what does $+ 98 - 115$ represent:

Q. Represent each of the following rational numbers on the number line:

(i)

\frac{1}{3}

(ii)

\frac{2}{7}

(iii)

\frac{7}{3}

(iv)

\frac{22}{7}

(v)

\frac{37}{8}

(vi)

\frac{- 1}{3}

(vii)

\frac{- 3}{4}

(viii)

\frac{- 12}{7}

(ix)

\frac{36}{- 5}

(x)

\frac{- 43}{9}

Q. The marks of

30

students of a class, obtained in a test (out of

75

), are given below:

42, 21, 50, 37, 42, 37, 38, 42, 49, 52, 38, 53, 57, 47, 29

59, 61, 33, 17, 17, 39, 44, 42, 39, 14, 7, 27, 19, 54, 51

.
Form a frequency table with equal class intervals.

In a Ranji match, 20 teams scored the following scores. Arrange the given data in grouped frequency distribution.

Scores: 11, 15, 23, 25, 31, 33, 39, 42, 43, 49, 51, 56, 65, 75, 79, 89, 99, 98, 92, 91 [2 MARKS]

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If +42 represents 42 m above the water surface, what does each of the following represent: [4 MARKS] (i) -87+55 (ii) +98-115 (ii) +36+57-73 (iv) -42-23+39

Each point: 1 Mark (i) -87+55 = -32 ⇒ 32 m below the water surface (ii) +98-115 = -17 ⇒ 17 m below the water surface (ii) +36+57-73 = 20 ⇒ 20 m above the water surface (iv) -42-23+39 = -26 ⇒ 26 m below the water surface

If +42 represents 42 m above the water surface, what does each of the following represent: [4 MARKS]

(i) -87+55

(ii) +98-115

(ii) +36+57-73

(iv) -42-23+39

Each point: 1 Mark

(i) -87+55 = -32
$\Rightarrow$ 32 m below the water surface

(ii) +98-115 = -17
$\Rightarrow$ 17 m below the water surface

(ii) +36+57-73 = 20
$\Rightarrow$ 20 m above the water surface

(iv) -42-23+39 = -26
$\Rightarrow$ 26 m below the water surface