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1. ### Maths problem: i don't know how to do (c), it's so difficult, thanks?

(a) P(red) = x/48 = 1/16, so x = 48/16 = 3. P(yellow) = y/48 = 1/12, so y = 48/12 = 4. (b) The...

分類：科學及數學 > 數學 2020年09月13日

2. ### 我的ROCA座廁水箱有裂縫,想只換個水箱,想知道那裡可以買到?謝謝!?

Generally, water tanks are universal. So you don't need to buy a matching tank. If for some reasons...

3. ### How to do , thanks !?

...1　3　1 ∴ L.C.M. of 25,45,75 = 5x5x3x3 = 225 So , ferries set off at the same time every 225 min.,that is, 3hr. 45 min...

4. ### Maths problem: how to do , thanks?

...3:45 = 13:45 13:45 + 3:45 = 17:30 17:30 + 3:45 = 21:15 21:15 + 3:45 = 01:00 ... So , possible cases are 1:45 p.m., 5:30 p.m., 9:15 p.m.

分類：科學及數學 > 數學 2020年07月19日

5. ### Only check?

2. consequently 6. as a result 8. As 10. so that all others are correct.

分類：社會及文化 > 語言 2020年08月02日

6. ### Teach me please , thank you !?

... ago, Paul = 32-4 = 28 4 years ago, John = 18-4 =14 So Paul was twice the ago of John.

分類：社會及文化 > 語言 2020年07月29日

7. ### 香港傷殘證過了期超過兩月?

It depends on your condition. Unless you are previously classified as permanent, generally medical evidence will be required. So you should make the inquiry with the organization issuing the identification.

8. ### Maths problem: how to do, thanks?

/_PQC=a /_QCB=a+x so a+b+a+x=180 x=180-2a-b

分類：科學及數學 > 數學 2020年08月21日

9. ### Maths problem: How to do, thanks?

Let length of rectangle = y cm => its width = 18-y new length = 1.4y new width = 0.5(18-y) 1.4y - 0.5(18-y) = 10 1.9y = 19 ∴ y = 10 cm So , original length = 10 cm & original width = 0.5(18-10) = 4 cm

分類：科學及數學 > 數學 2020年08月12日

10. ### Maths problem:為何我計多次（a)也是（-1,-1）?

...k) As centre lies on x-axis, k=0 ∴ centre=(h,0) So , eqt. of circle: (x-h)²+y²=r² - - - - - (#) From A...

分類：科學及數學 > 數學 2020年05月03日

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