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(in arithmetic) 1. The students go boating. The boat is the same size. If there are six people in a group, there will be five more. If there are eight people in a group, there will be seven more. If there are ten people in a group, there will be one less. How many people go boating? 2. For a two digit number, the sum of one digit and ten digit number is 8. If the number on ten digit of the two digit number is swapped with the number on one digit, the new two digit number is 18 larger than the original two digit number, what is the original two digit number? 3. Little careless copied 10 * (a + 2) into 10 * a + 2. Think about it. What's the difference between his result and the correct answer? Don't use letters in the second question
1. In a group of six, there will be five more; in a group of eight, there will be seven more
First, find the least common multiple: [6,8,10] = 120-1 = 119
2、a+b=8 （10a+b）-（10b+a）=18 9a-9b=18 a-b=2
So: B = (8-2) / 2 = 3, a = 5, the number is: 35
3、
10*(a+2)=10a+20 10a+20-（10*a+2）=18
How to use arithmetic to solve a mark problem in Grade 6
There are two bags of rice. The weight of the first bag is 7 / 8 of that of the second bag. Now when 15 kg is poured out of the second bag and put into the first bag, the weight of the second bag is 1 / 2 of that of the first bag?
It's all equations. I want arithmetic
(1) Second bag: 15 ÷ (7 / 8-1 / 2) = 40 (kg)
First bag: 40 × 7 / 8 = 35 (kg)
A: the first bag is 35kg; the second bag is 40kg
(2) Second bag: (15 + 15 × 2) / (2-7 / 8) = 40 (kg)
First bag: 40 × 7 / 8 = 35 (kg)
A: the first bag is 35kg; the second bag is 40kg
Elementary school application questions, online, etc. · best use arithmetic!
A. B is 13.5km away from each other. A and B go back and forth from a and B at the same time. A returns earlier than B. on the way, they meet at point C for the first time and D for the second time. It is known that the time interval between the two encounters is 3 hours and 20 minutes. C and D are 3km apart. The speed of a and B is calculated
3 hours 20 minutes = 10 / 3 hours. A returns earlier than B, i.e. a is faster than B. the first meeting is in C, i.e. two people travel a whole journey (13.5 kilometers), and B travel CB a distance. From the first meeting to the second meeting, i.e. 10 / 3 hours, two people travel a total of two whole journey, including: (1) the sum of speed of two people is 2 * 13.5 / (1
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