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Several math problems
1. solution: let a loan x million yuan, then b's loan is (30-x) million yuan, so there is an equation:

0.12x+0.14 (30-x) = 4, that is, 0.02x=0.2, so x = 0.2/0.02 = 65,438+ten thousand yuan, 30- 10=20 (ten thousand yuan

And a6,543,800 yuan, b200,000 yuan.

2。 Solution: milk coffee * * *1/2+3/5+1= (2+110) cup.

Milk:1/2+(1/2) × (3/5)+(1/2) × (2/5) =1cup (coffee is added at the back, so milk is a cup).

So I drank (1+110) cups of coffee, and the coffee was110 cups.

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