bác nam được thuê sơn một mặt của một bức tường ,cứ sơn được 1m2,bác ấy được chả số tiền vừa đủ mua 2kg thóc.biết bức tường cao 7/2m và dài 10m.hỏi sau khi hoàn thành,bác namđược chả số tiền có thể mua...

To solve this problem, we can follow these steps: Step 1: Calculate the area of the wall that needs to be painted. The area of the wall is given by the formula: \[ \text{Area} = \text{height} \times \text{length} = \frac{7}{2}m \times 10m = 35m^2\] Step 2: Determine the amount of money Bác Nam earns for painting the wall. Given that Bác Nam earns enough money to buy 2 kilograms of rice after painting 1 square meter, we can set up the equation: \[35x = 2\] where \(x\) represents the amount of money earned per square meter. Solving for \(x\), we get: \[x = \frac{2}{35}\] Step 3: Calculate how much rice Bác Nam can buy with his earnings. Since he earns \(x\) money per square meter and paints a total area of 35 square meters, he will earn: \[35x = 35 \times \frac{2}{35} = 2\] This means Bác Nam can buy 2 kilograms of rice with his earnings. So, the final answer is: Bác Nam can buy 2 kilograms of rice with his earnings.