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)