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LenKa [72]
1 year ago
6

Lesson 15 Practice Problems

Mathematics
1 answer:
krok68 [10]1 year ago
5 0

Answer:

Step-by-step explanation:

Here, the region of the triangle with a base 4 cm and a level 3 cm.

That is, the region of a triangle=

1/2 × Base × Level

=1/2 × 4 × 3

=6 sq cm

The region of a square shape with a length 5 cm and a breadth 4 cm

The region of a square shape = Length × breadth

=5 × 4 =20 sq cm

The region of a square shape with a length 4 cm and a width 3 cm

=4 × 3 =12 sq cm

The region of a square with the side 4 cm.

The region of a square = side²=4²=16 sq cm

The absolute surface of the given polyhedron =6 + 6 + 20 + 12 + 16

=60 sq cm

From the above estimation, it is distinguished as a region of the triangle that is determined incorrectly.

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Answer:

<em>Number of story books bought = 100 </em>

<em> C.P. of each book = Rs. 135 </em>

<em> C.P. of all 100 books = Rs. (135×100)= Rs. 13500 </em>

<em> C.P. of 90 books = Rs. (135×90)= Rs. 12150 </em>

<em> Number of books donated = 10 </em>

<em> Number of books sold = 100-10=90 </em>

<em> Loss% in the transaction = 2% </em>

<em> S.P. of all books = (C.P./100)(100-loss%) </em>

<em>                          =Rs. (12150/100×98) </em>

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<em> = Rs. (12150/100×98/90) </em>

<em> = Rs. 132.3</em>

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