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Q.

At breakfast, the outside temperature was 350C . At lunch time, it had gone up by 50C , and then at dinner it had gone down by 20C . What was the temperature at dinner time?


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a

320 C

b

390 C

c

380 C

d

400 C 

answer is C.

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Detailed Solution

Concept- Solving the problem using simple linear equations and mathematical calculations.
Given is that,
Temperature at breakfast = 350C Now,
Temperature at lunch went up by 50C.
So, outside temperature at lunch will be:
= (Temperature at break fast + 50 C)
=350 C + 50 C = 400  C
And at dinner, the temperature went down by 20C  from what it was at lunch.
Therefore, outside temperature at dinner will be:
= (Temperature at lunch - 20 C)
=400- 20 C = 380  C
Hence, the correct option is 3) 380 C.
 
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At breakfast, the outside temperature was 350C . At lunch time, it had gone up by 50C , and then at dinner it had gone down by 20C . What was the temperature at dinner time?