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DaniilM [7]
3 years ago
13

There are 1200 students at a school and 390 of them are boys if each classroom holds 30 students how many classrooms are needed

at the school
Mathematics
1 answer:
vodomira [7]3 years ago
5 0

Answer:

40 classrooms

Step-by-step explanation:

Divide 1200 by 30.

1200÷30=40

If 390 students are boys just subtract 390 from 1200.

1200-390= 810

There must be 810 girls if there are 390 boys

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The weight Wkg of a metal bar varies jointly
maria [59]

Answer:

d = \sqrt{\frac{216W}{35L} }

Step-by-step explanation:

Given that W varies jointly as L and d² then the equation relating them is

W = kLd² ← k is the constant of variation

To find k use the condition W = 140 when d = 4 and L = 54, thus

140 = k × 54 × 4² = 864k ( divide both sides by 864 )

\frac{140}{864} = k , that is

k = \frac{35}{216}

W = \frac{35}{216} Ld² ← equation of variation

Multiply both sides by 216

216W = 35Ld² ( divide both sides by 35L )

\frac{216W}{35L} = d² ( take the square root of both sides )

d = \sqrt{\frac{216W}{35L} }

6 0
3 years ago
Stella bought a dinette set on sale for $725. The original price was $1,299. To the nearest tenth of a percent, what was the rat
kifflom [539]

Answer:

40%

Step-by-step explanation:

1299-725= 574

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8 0
3 years ago
BD bisects ∠ABC, m∠ABD=(7x−1)°, and m∠DBC=(4x+8)°. Find m∠ABD.
Naya [18.7K]

Answer:

  m∠ABD = 20°

Step-by-step explanation:

The bisector makes angles ABD and BDC congruent, so ...

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  3x = 9 . . . . . . add 1-4x to both sides

  x = 3

  m∠ABD = (7x-1)° = (7·3 -1)°

  m∠ABD = 20°

4 0
3 years ago
7.) A bag of 8 apples costs $1.50 at Sam's Orchard,
const2013 [10]

Answer:

a) 3.375 cents

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Step-by-step explanation:

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6 0
4 years ago
January, Scott earned $8,999. In February, he earned $2,387 more than in January. In March, Scott earned the same amount as in F
netineya [11]

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6 0
3 years ago
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