8
Q:

# Each edge of a cube is increased by 20% then the percentage increase in surface area of the cube is :

 A) 144% B) 40% C) 44% D) 72.8%

Explanation:

The surface area of a cube = 6${a}^{2}$ =  6 $sid{e}^{2}$

New  Surface area = 6 x 1.44${a}^{2}$

Therefore, %

Q:

When the price of whear was increased by 32%, a family reduced its consumption in such a way that the expenditure on wheat was only 10% more than before. If 30 kg per month were consumed before, find the new monthly consumption of family?

 A) 27 kgs B) 25 kgs C) 24 kgs D) 21 kgs

Explanation:

Initial wheat per kg cost be Rs. 100

Then, monthly expenditure of the family = 30 x 100 = 3000

After increase in cost,

Let P be new monthly consumption of family.

P x 132 = 110/100 x 3000

=> P = 25 kg.

0 162
Q:

12% of 70,000 is

 A) 8400 B) 7200 C) 6000 D) 5600

Explanation:

12% of 70,000

=> 12 x 70,000/100

=> 8400

Hence, 12% of 70,000 = 8,400

0 198
Q:

3 is what percent of 5?

 A) 45% B) 60% C) 72% D) 80%

Explanation:

Here it is asked that 3 is what percent of 5

Let 3 is K percent of 5.

=> K x 5/100 = 3

=> K = 300/5 = 60

Hence, 3 is 60% of 5.

5 759
Q:

of 259.99 = ? % of 1247.9

 A) 96 B) 100 C) 78 D) 88

Explanation:

Given

of 259.99 = ? % of 1247.9

24/5 x 260 = ? x 1248/100

? = 1248 x 100/1248

? = 100.

5 717
Q:

Which value is equal to 5% of 1,500?

 A) 35 B) 55 C) 75 D) 45

Explanation:

In the question it is asked for 5% of 1500

5 x 1500/100 = 15 x 5 = 75.

Hence, 5% of 1,500 is equal to 75.

10 662
Q:

80% of 900 + ${\mathbf{16}}^{\mathbf{2}}$ x 4 x ? =

 A) 0.5 B) 1 C) 4 D) 0

Explanation:

80x900/100 + 256 x 4 x ? = 1331 - 99

720 + 1024 x ? = 1232

? = 1232 - 720/1024

? = 512/1024 = 0.5

? = 0.5

8 551
Q:

What is 70 of 50?

 A) 35 B) 38 C) 42 D) 44

Explanation:

what is 70 of 50 means 70% of 50

Hence, 70 of 50 is 35.

4 836
Q:

Mohan spends 23% of an amount of money on an insurance policy, 33% on food, 19% on children’s education and 16% on recreation. He deposits the remaining amount of Rs. 504 in bank. How much amount does he spend on food and insurance policy together?

 A) Rs. 2326 B) Rs. 5876 C) Rs. 1741 D) Rs. 3136

Explanation:

Let total amount = Rs. P

Total expenditure = (23 + 33 + 19 + 16)% of P = 91%ofP

Remaining money = (100 - 91)% of P = 9% of P

But given in the question that,

9% of P = 504

9p/100 = 504

=> P = 50400/9

=> P = Rs. 5600

Required money spent on Food & Insurance = 23 + 33 %

= 56% of 5600

= 56 x 5600/100 = 56 x 56 = Rs. 3136