Q&A - PSLE Math
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How to solve this question ?
The sum of 4 numbers is 80.If you add 3 to the first number, subtract 3 from the second number,multiply the third number by 3 d divide the fourth number by 3,the result will be equal.What is the difference between the largest and the smallest of the original numbers. -
charsen:
HiHow to solve this question ?
The sum of 4 numbers is 80.If you add 3 to the first number, subtract 3 from the second number,multiply the third number by 3 d divide the fourth number by 3,the result will be equal.What is the difference between the largest and the smallest of the original numbers.
First thing first, is such a question within the syllabus?
The original numbers are 12,18,5 and 45.
Difference ------ 45-5 ------ 40
Best wishes -
Michaelia0816:
Hi girl
A train 210m long was travelling at 90km/h and it overtook a train travelling 72km per hour in 55s. What was the length of the second train?
From some of the questions posted by you, it’s safe to assume that you are in the top class in your school.
Your school teacher has been giving you some pretty interesting questions if those questions are from your homework.
Let's give a slight tweak to your train question. Instead of moving in the same direction, change it to moving in opposite direction.
Two trains, A and B are travelling in opposite direction at 90km/h and 72km/h. The length of train A is 210m. If they cross each other in 8 seconds, find the length of the train B?
Try it only when you’ve completed all your homework.
Best wishes -
A square is incribed in a circle. If the area of the square is 70cm2, what the area of the circles? (Take pi as 22/7)
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Tianzhu,of course that our class is top, this is of course my homework, it even can photo it and post it on twitter.
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Tianzhu, pls help with the question on top of my pervious post, it my last question!
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Michaelia0816:
A square is incribed in a circle. If the area of the square is 70cm2, what the area of the circles? (Take pi as 22/7)
Hi
Please take a look at this similar question.
Area of the outer square ------ 140
140 ------ d*d where d is the diameter of the circle.
Area of circle -----pi*d^2/4 ----- 22/7*140/4 ------ 110
Hope this helps.
Best wishes![](\"http://farm7.staticflickr.com/6151/6191262010_71cc0ec1fd_z.jpg\")
http://farm7.staticflickr.com/6151/6191262010_71cc0ec1fd_z.jpg\">
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Do the 140cm2 get by 70cm2*2
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Now I understand how 140cm2 is get
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Thx :finally finished!:
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