5
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That number is -5.
x + -16 = -21
x = -21 + 16
x = -5
Checking:
-5 + -16 = -21
-21 = -21
16 21 22 29
...so the number is 10 less than 16. Can you work it out now...?
Expressed as a mixed number in its simplest form, 21/16 is equal to 1 5/16 or one and five sixteenths.
The question cannot be answered because it is ambiguous. Does "twice the sum of 16 and a number" mean "2*16 + x" or does it mean "2*(16 + x)"
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