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Which expert has math exercises for the third grade in Shanghai primary school?
1. The school assigned the task of planting 270 trees to the sixth and fifth grades according to 5: 4. How many trees were planted in Grade 6 and Grade 5 respectively?

2. Mercury chloride is made of mercury chloride and distilled water in the ratio of 1: 50. How many kilograms of mercuric chloride and distilled water do you need to make 3.06 kilograms of mercuric chloride?

3. Yongning Township has a 4.5-hectare arable land, where grain crops and cash crops are planted, and the area ratio of oil crops is 9: 4: 2. How many hectares are planted in each of these three crops?

4. The school bought three bottles of red, blue and black ink * *165, and their ratio was 6: 5: 4. How many bottles of red, blue and black ink did you buy?

5. Three kinds of vegetables ***8500 kg were delivered from the market, including 4300 kg of green vegetables, and the ratio of celery to spinach was 9: 6. How many kilograms of celery and spinach?

6. The ratio of the degrees of the three internal angles of a triangle is 1: 3: 5. Find the degree of each inner angle of this triangle and explain what triangle it is.

7. Form a triangle with 96 cm long iron wire, and the length ratio of three sides of the triangle is 3: 4: 5. What are the lengths of the three sides?