हिंदी में जवाब दो: A submarine is at a depth of 120 m below sea level. It rises by 45 m and then descends by 30 m. At what depth is it now?

Step 1: Representing initial depth

We represent the depth below sea level as a negative value. So, an initial depth of 120 meters below sea level is written as -120 meters.

Step 2: Calculating depth after rising

When the submarine rises, its depth decreases. So, we add the distance it rises (45 m) to its initial depth.

Step 3: Calculating depth after descending

After rising, the submarine descends. Descending means its depth increases further below sea level, so we subtract the distance it descends (30 m) from its current depth.

Step 4: Simplifying the expression

First, we calculate the depth after rising: $-120 + 45 = -75$ meters. Then, we subtract the descending distance: $-75 - 30 = -105$ meters. The negative sign indicates that the submarine is 105 meters below sea level.

More from this chapter

• हिंदी में जवाब दो: Mark the following on a number line and state which is the greatest: −4, 2, −1, 3 and 0.
• हिंदी में जवाब दो: The temperature at a hill station was 5 °C at noon. It fell by 3 °C every hour for the next 4 hours. What was the temperature after 4 hours?

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