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Mathematical belt calculation
1. I read 35 pages this weekend, which is exactly five-sevenths of this extracurricular reading. How many pages are there in this extracurricular reading?

Answer: 35/ 5/7 =49 (page)

2. A cup of 250ml fresh milk contains about 3/ 10 g of calcium, accounting for 3/8 of the calcium needed by an adult in one day. About how much calcium does an adult need a day?

Answer: Three tenths/three eighths = four fifths (g)

The speed of artificial earth satellite is 8km/s, which is equivalent to 40/57 of the speed of spacecraft. What is the speed of the spaceship?

Answer: 40 out of 8 = 57 out of 5 (km/s)

Generally, the mass of ice with the same volume is one tenth less than that of water. There is a piece of ice weighing 9 kilograms. If the volume of a bucket of water is equal to the volume of this ice, how much does it weigh?

Solution: 9/(1-110) =10 (kg)

5. My monthly salary is 1500 and your mother's monthly salary is 1000. The monthly expenses account for about three-fifths of our salary. What is the monthly expenditure of our family?

Solution: (1500+ 1000)x three fifths = 1500 (yuan)