Question: Polly’s mother packed party bags for her guests at her son’s birthday party. In every bag she puts 4 sweets and 3 biscuits among other things. Altogether she packed 100 sweets. How many biscuits did she pack?
1. **State the problem:** Polly’s mother packed party bags with 4 sweets and 3 biscuits each. There are 100 sweets in total. We need to find how many biscuits she packed.
2. **Define variables:** Let $n$ be the number of party bags.
3. **Write the equation for sweets:** Since each bag has 4 sweets, total sweets are $4n$. Given total sweets are 100, so:
$$4n = 100$$
4. **Solve for $n$:**
$$n = \frac{100}{4}$$
$$n = 25$$
5. **Calculate biscuits:** Each bag has 3 biscuits, so total biscuits are:
$$3 \times 25 = 75$$
6. **Answer:** Polly’s mother packed **75 biscuits** in total.