1 and 1 How much is the ruler and two pencils? 1×2+2× 1=4 (yuan)

2. How much are two pens and 1 pencils? 2×13+/kloc-0 /×1= 27 (yuan)

3. 1 ruler and 1 what is the ball? 2× 1+6× 1=8 (yuan)

4. 1 How much is a ball and a toy? 1× 6+15×1= 21(yuan)

5. How much more is a pen than a ball? 15×1-6×1= 9 (yuan)