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MakcuM [25]
3 years ago
9

Three times the sum of a number and four and five

Mathematics
1 answer:
BabaBlast [244]3 years ago
6 0

Answer:

3x+27

Step-by-step explanation:

3(x+4+5)=

3x+12+15=

3x+27

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If the surface area of the box in the diagram is 204.25 square feet, what is the value of ‘x’?
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Note: Consider x be the breadth of the box.

Given:

The surface area of the box is 204.25 square feet.

Length of the box = 10 ft

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To find:

The value of x.

Solution:

The surface area of a cuboid is:

SA=2(lb+bh+hl)

Where, l is length, b is breadth and h is height of the cuboid.

Putting SA=204.25,  l=10,\ b=x,\ h=6.5 in the above formula, we get

204.25=2(10\times x+x\times 6.5+6.5\times 10)

204.25=2(10x+6.5x+65)

204.25=2(16.5x+65)

Using distributive property, we get

204.25=2(16.5x)+2(65)

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204.25-130=33x

74.25=33x

Divide both sides by 33.

\dfrac{74.25}{33}=x

2.25=x

Therefore, the correct option is B.

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