1. Problem Understanding
Estimate the number of pizzas (all types: fast-food chains + local outlets + home-delivery / dine-in) sold in Mumbai per day.
This is a consumption / city-level guesstimate using a top-down approach.
2. Approach Summary (Top-Down)
City population → households & eat-out frequency → share choosing pizza → average pizzas per order → total pizzas/day
3. Step-by-Step Solution
Step 1: Mumbai population (city + suburbs)
Use a round number: ~20 million people.
Step 2: Estimate number of households
Average household size ≈ 4
Households ≈ 20M ÷ 4 = ~5 million households
Step 3: Eating-out / ordering frequency
Assume on any given day, ~10% of households eat out or order food (reasonable for a big metro).
Daily eating-out / ordering households ≈ 5M × 10% = 500k households
Step 4: Share of food orders that are pizza
Not all orders are pizza. Across categories (local meals, biryani, Chinese, pizza, burgers, etc.), pizza is popular but niche.
Assume ~6–8% of food orders are pizza. Pick midpoint 7%.
Pizza-ordering households per day ≈ 500k × 7% = 35k orders
Step 5: Pizzas per order
Many pizza orders are single pizzas per household; sometimes families buy 2. Assume 1.2 pizzas per pizza-order (mix of singles and family/party orders).
Pizzas from household orders ≈ 35k × 1.2 ≈ 42k pizzas
Step 6: Add commercial / dine-in / office pizzas
Beyond household orders, add pizza sold in restaurants, corporate cafeterias, events, and late-night outlets.
Estimate this as an extra 20–30% on top of home-delivery orders.
Add 25% of 42k = ~10.5k
Step 7: Total pizzas per day in Mumbai
Household delivery + additional = 42k + 10.5k ≈ 52.5k
Round to a clean number: ~50,000–55,000 pizzas per day
4. Final Answer
Approximately 50,000 pizzas are sold in Mumbai every day.
(Reasonable range: 40k–60k depending on festivals, weekends, and promotions.)
5. Interviewer-Ready Summary
- Population ≈ 20M → households ≈ 5M
- Daily ordering households ≈ 10% → 500k
- Pizza share of orders ≈ 7% → 35k pizza orders
- Avg pizzas per order ≈ 1.2 → ~42k pizzas
- Add commercial/dine-in ≈ +25% → ~52k
- Final: ~50k pizzas/day (range 40k–60k)