The water level of a river in May was 30 cm below the 'normal' mark. After the rains, the level of water went up by 25 cm. If the water level in May is written as '-30', the level after the rains would be*
A. -5
B. -55
C. 5
D. 55
Answers
Answer:
(-5)
Step-by-step explanation:
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Answer:
The final anser is -5 cm. Option A is correct.
Step-by-step explanation:
Given
The water level is 30cm below the normal mark.
After the rains, the water level rises by 25 cm.
To solve
Find the new water level after the rains.
Let us take normal water level at 0.
In May, the water level is 30 cm below the normal mark.
As numbers below 0 have negative sign, so 30 cm below normal mark can be written as -30.
After the rains , water level increases by 25 cm. As there is an increase , we have to add 25 cm in the original value -30 cm.
So, (-30)+(25)
As both -30 and 25 are integers and they have unlike signs, so we need to find their difference.
As 30>25,
So 30-25= 5
30 has a negative sign, so we put negative sign with 5 also.
New water level is 5 cm below the normal mark.
As it is below 0, we write it as -5 cm.
So, option A is correct.
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