Answer:

1.given fact: 3.50 kg of pork , 4.75 kg of chicken and 2.5 kg of beef

2.asked: amount of meat that mother bought clue

3.clue:all

4.operation:addition

5.strategy:using variable / an equation

6.number sentence: 3.50+4.75+2.5=N

7.solution: 3.50+4.75+22.5=10.75

8.answer:mother bought 10.75kg of meat

9.check 10.75-2.5=8.25,8.25-4.75=3.5