10. If eleven is added to the difference of a number and twenty-one, the sum is one bundred fen. Answer:

Answer:

120

Step-by-step explanation:

Question:

If eleven is added to the difference of a number and twenty-one, the sum is one hundred ten

Formula:

let x be the missing number

$x - 21 + 11 = 110$

Add -21 and 11

$x-10=110$

Add 10 to both sides of the equation

$x-10+10=110+10$

Add the numbers

$x=110+10$

$x=120$

Checking:

Substitute the answer that we find

$x - 21 + 11 = 110$

$120-21+11=110$

$99+11=110$

$110=110$

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10. If eleven is added to the difference of a number and twenty-one, the sum is one bundred fen. Answer:​