1. **Problem statement:** Dexter found a snake skeleton with 310 vertebrae, each having 2 ribs attached. We need to find: (a) Number of ribs (b) Total bones from vertebrae and ribs (c) Total bones including 10 head bones (d) Difference in bones compared to an adult human skeleton (206 bones) 2. **Formula and rules:** - Total ribs = number of vertebrae $\times$ ribs per vertebra - Total bones (vertebrae + ribs) = vertebrae + ribs - Total bones including head = vertebrae + ribs + head bones - Difference = snake total bones $-$ human bones 3. **Calculations:** (a) Ribs = $310 \times 2 = 620$ (b) Total bones (vertebrae + ribs) = $310 + 620 = 930$ (c) Total bones including head = $930 + 10 = 940$ (d) Difference with human skeleton = $940 - 206 = 734$ 4. **Explanation:** - Each vertebra has 2 ribs, so multiply vertebrae by 2 to get ribs. - Add vertebrae and ribs for total bones excluding head. - Add head bones to get total bones. - Subtract human bones to find how many more bones the snake has. **Final answers:** (a) 620 ribs (b) 930 bones (c) 940 bones (d) 734 more bones