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algol13
4 years ago
12

If a certain number is added to the numerator and denominator of 8/11, the result is 6/7. Find the number.

Mathematics
1 answer:
Juli2301 [7.4K]4 years ago
5 0

Answer:

x = 10

Step-by-step explanation:

<u>8 + x </u>=  <u>6</u>

11 + x     7

Cross Multiply

6(11 + x) = 7(8 + x)

66 + 6x = 56 + 7x

10 = x

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Answer:

Volume: 112 m³.

Surface area: 172 m².

Step-by-step explanation:

The volume is the base times height times length. So, the volume will be 2 * 8 * 7 = 16 * 7 = 112 m³.

The surface area is 2lw + 2lh + 2wh. l = 8; w = 7; h = 2.

2(8)(7) + 2(8)(2) + 2(7)(2) = 2 * 56 + 2 * 16 + 2 * 14 = 112 + 32 + 28 = 112 + 60 = 172 m².

Hope this helps!

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Answer:

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