Math o Matics

  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)

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

0.001 is equivalent to (a) 10% (b) 1% (c) 0.01% (d) 0.1% SOLUTION : As we know that to convert a fraction of decimal into percentage we have to multiply it by 100   therefore 0.001   * 100 = 0.1 % option (d) Watch Full Video Solution

The time duration of 2 hour 45 minutes is what percent of day ? (a) 7.218% (b) 11.45% (c) 8.5% (d) 8.24 SOLUTION : The time duration of 2 hour 45 minutes We have to convert the hour in minutes therefore 2 hr + 45 min = 2 * 60 + 45 120 + 45 = 165 Minutes Now convert a day in minutes   a day have 24 hours and each hour have 60 minutes 24 * 60 = 1440 minutes Therefore percentage of 2 hr 45 minutes to a day is 165/1440 * 100 = 11.45 % option (b) Watch video solution

If 30% of A = 0.25 of B =1/5 of C, then   A:B:C is equal to: (a) 5:6:4 (b) 5:24:5 (c) 6:5:4 (d) 10:12:15 SOLUTION 1: Simplify the equation 30/100 of A = 0.25 of B = 1/5 of C 3/10 * A = 25/100*B = 1/5*C A/(10/3) =B/4 = C/5 Multiply the denominator by 3 A/10=B/12=C/15 A:B:C= 10:12:15 Option (d) CLICK HERE FORE VIDEO SOLUTION