The area of a rhombus with diagonals 12cm and 20cm is________sqcm

Solution
Number of lamp posts
= \(\frac{1000}{25}+1\) =41
A box contains coins(equal number of every one) of rupee and half rupee, coins of 25 paise, 10 paise, 5 paise value, 2 paise value and one paise value. The total value of coins in the box is Rs. 1158. Find the number of coins of each value.

Solution
Area of the rhombus
=^{1}⁄_{2}d_{12}d_{2}=sup>1⁄_{2}×12×20
= 120 sq. cm
What is the meaning of the word ‘beckon’?

Solution
Let the number of each kind of coins be x.
\(∴x+\frac{x}{2}+\frac{x}{4}+\frac{x}{10}+\frac{x}{20}+\frac{x}{50}+\frac{x}{100}=1158\)\(\Rightarrow \frac{100x+ 50x+ 25x+10x+ 5x+ 2x+ x}{100}=1158\)
⇒ 193x = 115800
\(∴x=\frac{115800}{193}= 600\)
Aditi read ^{4}⁄_{5} th of Tintin comic book which has 100 pages. How many pages of the book is not yet read by Aditi ?

Solution
Number of unread pages
\(=100\times \frac{1}{5}=20\)
The length of a room is three times its breadth. If the perimeter of the room is 64 cm, then its breadth is __ cm.

Solution
Let the breadth of the room be xcm.
∴ Length = 3x cm
∴ 2 (3x + x) = 64
⇒8x= 64 ⇒x=^{64}⁄_{8}= 8 cm
The number which is neither prime nor composite is
Area of a parallelogram whose base is 9 cm and height 4 cm is_________sq cm.

Solution
Area ofthe parallelogram
= base × height
= (9 × 4) sq.cm. = 36 sq.cm
The difference between the greatest number and the smallest number of 5 digits formed by 0, 1,2,3 and 4 using all but once is:

Solution
Largest five digit number
formed by 0, 1, 2, 3 and 4 =4321O
Smallest five digit number formed
by 0, 1,2,3 and 4 = 10234
∴ Required difference
= 43210  10234 = 32976
Directions: What approzimate value should come in place of the question mark (?)in the following questions? (You are not expected to calculate the exact value)
561204 x 58 = ? x 55555

Solution
\(?=\frac{561204 \times 58}{55555}= 586\)
Directions: What approzimate value should come in place of the question mark (?)in the following questions? (You are not expected to calculate the exact value)
(9321 + 5406 + 1001) ÷ (498 + 929 + 660) =?

Solution
? = (9321 + 5406 + 1001) ÷ (498 + 929 + 660)
= 15728 ÷ 2087 = 7.5