বিসিএস প্রিলিমিনারি সাধারণ বিজ্ঞান গতি

Example 28 :
If the price of diesel is increased by 25% , by how much percent a car owner must reduce his consumption in order to maintain the same budget ?
Answer :
25% = 25 x 100 / 125 = 20% less
20% a car owner must reduce his consumption in order to maintain the same budget .

Example 29 :
If the sugar price is increased by 8% , then by how much percent should a housewife reduce her consumption of sugar , to have no extra expenditure ?
Answer :
Less% = 8 x 100 / 108
= 800 / 108
= 7.40%

Example 30 :
In an general election a candidate who gets 64% of the total votes and wins by 476 votes . What is the total number of votes polled ?
Answer :
64% –  ( 100% – 64% )
= 64% – 36%
= 28% = 476
= 476 x 100 / 28 = 1700.

Example 31 :
Sanjay got 88 marks in Bangla , 81 marks in Science , 74 marks in Maths , 68 marks in Social Science and 57 marks in History . The maximum marks of each subject is 100 . How much overall percentage of marks did he get ?
Answer :
Percentage = 368 x 100 / 500 = 73.6

Example 32 :
In a class test , it is required to get 45% marks to pass . Joy got 618 marks and failed by 57 marks . What is the maximum marks in class test ?
Answer :
Joy got 618 marks and failed by 57 marks
X x 45% = 618 + 57
X x 45% = 675
X = 675 x 100 / 45  = 1500.

Example 33 :
A engineering student has to secure  60% marks to pass . He gets  70 and fails by 50 marks . Find the maximum marks .
Answer :
He gets 70 and fails by 50
So , 60% = 70 + 50
60% = 120
100% = 120 x 100 / 60 = 200 marks
So , the maximum marks is 200 .

Example 34 :
The average marks of Rahim in 9 subject is 68 . His average marks in 8 subjects except Math is 65 . How many marks did he get in Math ?
Answer :
( 68 x 9 ) – ( 65 x 8 ) = ?
612 – 520 = 92.

এই লেকচারের পরের পেইজে যেতে নিচের …. তে ক্লিক কর।