F.2 math屎

1) ($150-$135)/$150 x 100% = $15/$150 x 100% = 10%

2) The no. of total questions in the test: 18/0.75 = 24
The no. of questions Sandy did not attempt = 24-18 = 6
or = 24 X (1-75%) = 24 X 25% = 24 x 0.25 =6


3) 3 hours and 1 minute = 181 minutes
Time Chris needed to complete the race last year = 181 minutes/ (1-12%)
= 181 minutes / 88%
= 181 minutes / 0.88
= 205.68 minutes
( or 3 hours 25.68 minutes)

1)(135-150)/150*100%
= -10%
so損失10%
2)打中文ar唔該
3)(3*60+1)*(1-12%)
=141.18min

1) 10%
2) 6
3) about 206 minutes or 3 hours 26 minutes

2007-07-27 15:01:37 補充：
Q1. The price difference is $150-$135=$15, % of original price Ricky saved is 15/150=10%; The equation : [(150-135)/150]X100% =10%

2007-07-27 15:02:10 補充：
Q2. Total questions in the test paper is 18/0.75 = 24The number of question she did not attempt = Total questions - number of questions she attempted = 24-18 = 6The equation : (18/0.75)-18 =6

2007-07-27 15:03:13 補充：
Q3. The time needed for him to complete a Marathon race last year :The equation : 181/(1-12%) = 205.6818 = 3 hrs 26 mins or 206 mins (to the nearest integer)