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Sveta_85 [38]
3 years ago
11

What is the missing numerator?

Mathematics
1 answer:
N76 [4]3 years ago
3 0

Answer:

  3

Step-by-step explanation:

As with any other addition fact problem, you can isolate the unknown term by subtracting the unwanted constant.

  5/7 +x/6 = 51/42

  x/6 = 51/42 -5/7 . . . . . subtract 5/7 from both sides

  x/6 = 51/42 -30/42 = 21/42 = 1/2 . . . . . complete the subtraction

  x = 6(1/2) = 3 . . . . . . . . multiply by 6

The missing numerator is 3.

_____

<em>Alternate solution</em>

Multiply the equation by 42:

  30 +7x = 51

  7x = 51 -30 = 21 . . . . . subtract 30

  x = 21/7 = 3 . . . . . . . . divide by the coefficient of x

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