7+3+ 10 = 20 (yuan)

Second,

12÷2-3.5=2.5

Third,

Half a glass of water and half a glass of water make a glass of water.

Fourth,

(16+4) ÷ (8-6) = 10 (article)

6× 10+ 16 = 76 (person)

Five,

The least common multiple of 3, 5 and 7 is 3× 5× 7 = 105.

3-2= 1,5-4= 1,7-6= 1

105- 1 = 104 (piece)

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