Question

1. Which one of the following is Correct? a) – 50 +40 = 10 b) – 100+ (-20) = 120 c) 49+56 = 105 d) 78 +(-16) = -62 ans​

Answer 1

Explanation:

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Answer 2

c) 49 + 56 = 105 is the right option

Given:

Given four equations:

a) – 50 +40 = 10

b) – 100+ (-20) = 120

c) 49+56 = 105

d) 78 +(-16) = -62

To find:

Find the right option

Solution:

We will check each equation and find the errors

a) - 50 + 40 = 10

=> negative number + positive number we must subtract the two, then check which of the two numbers are greater keeping the sign aside

=> In this case 50 > 40, ∴ answer must be -10 not 10

b) – 100+ (-20) = 120

=> negative number + negative number the answer is always negative

=>  ∴ answer must be -120 not 120

c) 49+56 = 105

=> positive number + positive number the answer is always positive

=>  ∴ answer is 105

=> this is correct

d) 78 +(-16) = -62

=> negative number + positive number we must subtract the two, then check which of the two numbers are greater keeping the sign aside

=>  In this case 78 > 16, ∴ answer must be 62 not -62

Hence c) 49 + 56 = 105 is the right option

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