**11) 1.5, 2.3, 3.1, 3.9, … What number should come next?**

**Answer**: 4.7

**Explanation**: +0.8, So, 3.9 + 0.8 = 4.7

**12) 14, 28, 20, 40, 32, 64, … What number should come next?**

**Answer**: 56

**Explanation**: First, multiply by 2 and then subtract 8. So, 64 – 8 = 56

**13) 2, 4, 6, 8, 10, … What number should come next?**

**Answer**: 12

**Explanation**: + 2, So, 10 + 2 = 12

**14) 201, 202, 204, 207, … What number should come next?**

**Answer**: 211

**Explanation**: +1, +2, +3, ……… So, 207 + 4 = 211

**15) 544, 509, 474, 439, … What number should come next?**

**Answer**: 404

**Explanation**: -35, So, 439 – 35 = 404