Question

1. The height of a bookshelf is 30 cm. Three dictionaries of thicknesses
6 cm 4 mm, 7 cm 2 mm and 5 cm 5 mm are placed one on top of the
other on the shelf. How much space is left above the dictionaries?​

Answer 1

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The Space left above the dictionary is 10 cm 9 mm

Step-by-step explanation:

The height of a bookshelf = 30 cm

The thickness of the 1st dictionary = 6 cm 4 mm = 6.4 cm

2nd dictionary = 7 cm 2 mm = 7.2 cm

3rd dictionary = 5 cm 5 mm= 5.5 cm

Total Space covered for three dictionaries = 6.4 + 7.2 + 5.5 = 19.1 cm

The space left above the dictionaries = The height of bookshelf - total space covered by dictionaries

= 30 - 19.1

= 10.9 cm = 10 cm 9 mm

Thus, The Space left above the dictionary is 10 cm 9 mm

$\Huge \boxed{ \colorbox{gold}{hope \: this \: helps}}$

Answer 2

Step-by-step explanation:

Given:-

• Height of bookshelf → 30 cm

Now, space left above the dictionaries = Height Of Bookshelf - Sum Of Thickness Of All Three Dictionaries.

→ Space left above dictionaries = 30 cm - (6.4 + 7.2 + 5.5) cm

→ Space left above dictionaries = (30 - 19.1) cm

→ Space left above dictionaries = 10.9 cm = 10 cm 9 mm

Therefore, the space left above dictionaries is 10.9 cm or 10 cm 9 mm.

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