B. Translate the mathematical phrases or sentences into letters or symbols.
1. The number increased by 25
2. The product of a and b a
3. Four times a number subtracted from 80
4. When 20 is added to two times a number, the result is 70.
5. The sum of a number and 10 minus 30 is 30.
Answer:
- x+25
- a×ba
- 4x-80
- 20+2x=70
- x+10-30=30