**What is the missing number?**

**6+4=2109+2=7118+5=3135+2=377+6=1139+8=11710+6=41615+3=?**

**Solution:**

**6+4=210, 6-4=2 & 6+4=10. Therefore 6+4=210**

**9+2=711, 9-2=7 & 9+2=11. Therefore 9+2=711**

**15+3=?, 15-3=12 & 15+3=18. Therefore 15+3=1218**

**Answer: 1218**

**What is the missing number?**

**6+4=2109+2=7118+5=3135+2=377+6=1139+8=11710+6=41615+3=?**

**Solution:**

**6+4=210, 6-4=2 & 6+4=10. Therefore 6+4=210**

**9+2=711, 9-2=7 & 9+2=11. Therefore 9+2=711**

**15+3=?, 15-3=12 & 15+3=18. Therefore 15+3=1218**

**Answer: 1218**