Math o Matics

If 60% of A = ¾ of B, the A: B is (a) 9:20 (b) 20:9 (c) 4:5 (d) 5:4 SOLUTION : As per question 60 % of A = ¾ of B 60/100 * A = ¾ * B 6/10 * A = ¾ * B A/B=(3*10)/(4*6) A/B=5/4 option (d) Watch Full Video Solution

1.14 expressed as a percent of 1.9 is (a) 6% (b) 10% (c) 60% (d) 90% SOLUTION : 1.14 when expressed as percent of 1.9 Therefore 1.14/1.9 * 100 = 60 % option (c) 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