Question

CBSE Class IX NCERT pg. no. 213 ex. 13.1 q. No. 4.... plzzz urgent

Answer 1

$\huge\boxed{\underline{\mathcal{\red{H}\green{E}\orange{L}\purple{L}\pink{O}}}}$

Given:.

Length of brick= 22.5cm

Breadth of brick= 10cm

Height of brick= 7.5 cm

Total surface area = 2(lb+bh+hl)

= 2[(22.5×10) +(10×7.5) +(7.5×22.5)]

=2 [225+75+168.75]

=2×468.75

=937.50cm square.

Now,

937500÷9375= 100 bricks

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Answer 2

Step-by-step explanation:

Given:.

Length of brick= 22.5cm

Breadth of brick= 10cm

Height of brick= 7.5 cm

Total surface area = 2(lb+bh+hl)

= 2[(22.5×10) +(10×7.5) +(7.5×22.5)]

=2 [225+75+168.75]

=2×468.75

=937.50cm square.

Now,

937500÷9375= 100 bricks

hope this helps you❤