Math grade 1
Adding and subtracting, tens and ones, telling time, categories, nouns, verb tense, time order, and more.
Math grade 2
Placevalue models, contractions, irregular plurals, plants and animals, historical figures, and more.
Top Questions
Lê Quốc Trần Anh Coodinator
47 minute ago (02:33)
Nguyễn Mạnh Hùng 40 minute ago (02:40)
The ratio of the original is:
Red : Yellow : Blue = 12 : 2,5 : 0,5 = 24 : 5 : 1
So the red = 24k
Yellow = 5k
Blue = k
The main batch use:
5k = 30 (gallons)
=> k = 6
=> Red = 24 x 6 = 144(gallons)
Blue = 6 (gallons)
So the total of gallons is: 144 + 30 + 6 = 180 ( gallons)
Lê Quốc Trần Anh Coodinator
47 minute ago (02:33)Lê Quốc Trần Anh Coodinator
48 minute ago (02:32)Lê Quốc Trần Anh Coodinator
48 minute ago (02:32)
Huy Toàn 8A (TL) 30 minute ago (02:50)
Call the number of questions that Johnny correctly answers as \(x\) ( \(x\) \(\in\) Z)
We have : \(x+2=60\%.30\)
<=> x = 16
So Johnny answered 16 questions correct
Lê Quốc Trần Anh selected this answer.
Lê Quốc Trần Anh Coodinator
49 minute ago (02:31)Lê Quốc Trần Anh Coodinator
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53 minute ago (02:27)Lê Quốc Trần Anh Coodinator
53 minute ago (02:27)Lê Quốc Trần Anh Coodinator
56 minute ago (02:24)
sorry, I'd made a mistake. This question is already answered.

Nguyễn Mạnh Hùng 53 minute ago (02:27)
This question is old
In the first 240 miles, the car travel at the time:
240 : 60 = 4 (hrs)
In the next 160 miles, the car travel at the time:
160 : 80 = 2 (hrs)
The time remaining is: 9  4  2 = 3 (hrs)
The distance remaining is: 616  240  160 = 216 (miles)
The average speed of the car before the remainder of the trip in order for the car to arrive on schedule is: 216 : 3 = 72 (mph)
Lê Quốc Trần Anh Coodinator
57 minute ago (02:23)
Nguyễn Mạnh Hùng 46 minute ago (02:34)
When sale 20% off first, she will sale the number of cents larger.
So when she sale 20% off last, she will sale the number of cents smaller.
So for the more money she spend, she must sale the smallest.
=> She will sale 4,00 first and 20% in the second.
In case 1, she will sale:
25 x 20% + 4 = 9 (cents)
In case 2, she will sale:
( 25  4 ) x 20% + 4 = 8,2 (cents)
So in case 2, she will spend:
9  8,2 = 0,8 (cents)
Lê Quốc Trần Anh Coodinator
57 minute ago (02:23)Huỳnh Anh Phương
1 hour ago (02:18)
Nguyễn Mạnh Hùng 57 minute ago (02:23)
According to the title, we have: a = 9
b = 8
So b + a : 0,5 = 8 + 9 : 0,5 = 8 + 18 = 26 :)
Huỳnh Anh Phương selected this answer.
Lê Quốc Trần Anh Coodinator
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Nguyễn Mạnh Hùng 18 hour ago (08:30)
He has gone the number of miles is:
74592  74568 = 24 (miles)
He has gone the number of gallons is:
24 : 28 = \(\dfrac{6}{7}\)(gallons)
The cost of gas that was used for Ryosuke to drive his friend home from work is:
\(4.05\times\dfrac{6}{7}\approx3.5\)($)
Lê Quốc Trần Anh selected this answer.