বিসিএস প্রিলিমিনারি সাধারণ বিজ্ঞান গতি

Example 43 :
M is what % of N ?
Answer :
100M / N %

Example 44 :
How is 3 / 2% expressed as a  percentage ?
Answer :
3 x 100 / 2 = 150%

Example 45 :
35% of 250 + 25% of 350
Solution:
35 X 2.50 + 25 X 3.50 = 87.5 + 87.5 = 175
( We can write 250 / 100 = 2.50 and 350 / 100 = 3.50 when any number divide by 100 then put the two decimal point above the number which help in quick calculation )

Example 46:
20% of 400 + 60% of 800
Solution:
20 x 4 + 60 x 8 = 560( We can write 400 / 100 = .4 and 800 / 100 = .8 when any number divide by 100 then put the two decimal point above the number which help in quick calculation ).

Example 47 :
48 % of 200gm – 18% of 400gm
Solution:
48 x 2 = 96, 18 x 4 = 72, ( 96 – 72 ) = 24.

Example 48 :
5 is what percent of 50 ?
Solution:
(5 / 50)= 10 and (100/10)% = 10%

Example 49 :
How is 3 / 2% expressed as a decimal fraction ?
Answer :
3 / 2 % = ( 3 / 2 x 1 / 100 )  = 0.015

Example 50:
A is six times as large as B. The percent that B less than A, is:
Solution :
A = 6B So, B is less than A by 5B
Required percentage is :
(5B / 100)% = (5B / 6B x 100)% = 250 / 3 % .

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