Question

What should be added to
10 so that the sum becomes-21?
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Answer 1

Answer:

Let x be added

ATQ

10+x=(-21)

x= -21-10

x=-31

The answer is -31

Answer 2

Answer:

LET the number to be added be x...so that

10+x=-21

x=-21-10=-31

so the answer is -31