Math o Matics

 

 

 

 

 

 

 

 

 

 One third of 1206 is what per cent of 134  (a) 100% (b) 150 % (c) 200% (d) 300

  If 90% of A = 30% of B and B is x% of A then the value of x is (a) 800 (b) 300   (c) 700 (d) 400 SOLUTION : In such question 90 % of A = 30 % of B cancel % sign both the sides 90 * A = 30 * B       Therefore Take, A = 30 B = 90 As per question B = x% of A Putting the value of A and B in above equation 90 = x% of 30 x %= 90/30 x/100 = 90/30 X=90/30*100 = 300 % option (b) SOLUTION 2: In such question 90 % of A = 30 % of B Simply solve the equation and bring it to the form of B is x% of A B = 90/30 of A B = 3 of A, therefore to convert fraction or integer into % multiply it by 100 , B = 3* 100 * A B = 300% of A option (b)

  32 is what percent of 80 (a) 24 % (b) 25.6%   (c) 36 % (d) 40% SOLUTION : 32 is what percent of 80 32 is what % of 80 Therefore What % of 80 = 32 What % * 80   = 32 What % = 32/80 What * 1/100 = 32/80 What = 32/80 * 100 What = 40 % option (d)

In a research organisation , 70% of the employees are men and 60% of the employees are junior scientists and 70% of the junior scientists are men. Find the percentage of women who are not junior scientists : SOLUTION: Assume that total 100 employees work in that organisation 70% out of 100 are men = 70 left 30% out of 100 employees will be women = 30 60% out of 100 employees are junior scientists = 60 Out of 60 junior scientists , 70 % are men = 60 * 70/100 = 42 (men) 42 men are junior scientist. Women who are junior scientist are 60 – 42 = 18 Now, 18 women out of 30 are junior scientist Women who are not junior scientist = 30 – 18 = 12 % of women who are not junior scientist = 12/30   * 100 = 40% Subscribe us on youtube for more ! 😃

If 30 % of (B-A)= 18 % of (B+A), then the ratio A: B is equal to (a) 4:1 (b) 1:4 (c) 5:4 (d) 5:9 Watch Full Video Solution