CAT 2021 Slot 1 · DILR · Question 9
CAT 2021 Slot 1 previous year question on Caselet DI, with the answer and a step-by-step solution.
Set 2: Smoothies Sold by Three Women — this question belongs to a set. Read the full set with all 4 questions →
Ganga, Kaveri, and Narmada are three women who buy four raw materials (Mango, Apple, Banana and Milk) and sell five finished products (Mango smoothie, Apple smoothie, Banana smoothie, Mixed fruit smoothie and Fruit salad). Table-1 gives information about the raw materials required to produce the five finished products. One unit of a finished product requires one unit of each of the raw materials mentioned in the second column of the table.
Table-1
Finished product | Raw materials required |
Mango smoothie | Mango, Milk |
Apple smoothie | Apple, Milk |
Banana smoothie | Banana, Milk |
Mixed fruit smoothie | Mango, Apple, Banana, Milk |
Fruit salad | Mango, Apple, Banana |
One unit of milk, mango, apple, and banana cost ₹5, ₹3, ₹2, and ₹1 respectively. Each unit of a finished product is sold for a profit equal to two times the number of raw materials used to make that product. For example, apple smoothie is made with two raw materials (apple and milk) and will be sold for a profit of ₹4 per unit. Leftover raw materials are sold during the last business hour of the day for a loss of ₹1 per unit.
The amount, in rupees, received from sales (revenue) for each woman in each of the four business hours of the day is given in Table-2.
Table-2
Business Hour | Ganga | Kaveri | Narmada |
Hour 1 | 23 | 19 | 31 |
Hour 2 | 21 | 22 | 21 |
Hour 3 | 29 | 30 | 23 |
Hour 4 (last hour) | 30 | 27 | 22 |
The following additional facts are known.
1. No one except possibly Ganga sold any Mango smoothie.
2. Each woman sold either zero or one unit of any single finished product in any hour.
3. Each woman had exactly one unit each of two different raw materials as leftovers.
4. No one had any banana leftover.
- AEither 19 or 20 units.
- BEither 18 or 19 or 20 units.
- CEither 18 or 19 units.
- DEither 17 or 18 or 19 units.
Answer & solution
Answer: Option B
Solving the set
Step 1 – Selling price of each product = cost + 2 × (number of raw materials).
Product | Raw materials | Cost (₹) | Profit (₹) | Price (₹) |
Mango smoothie (MS) | Mango, Milk | 3 + 5 = 8 | 2 × 2 = 4 | 12 |
Apple smoothie (AS) | Apple, Milk | 2 + 5 = 7 | 4 | 11 |
Banana smoothie (BS) | Banana, Milk | 1 + 5 = 6 | 4 | 10 |
Mixed fruit smoothie (MF) | Mango, Apple, Banana, Milk | 11 | 2 × 4 = 8 | 19 |
Fruit salad (FS) | Mango, Apple, Banana | 6 | 2 × 3 = 6 | 12 |
Step 2 – Leftovers. Each woman has exactly one unit each of two different raw materials, none of them banana; they are sold at ₹1 below cost.
Leftover pair | Sale value (cost − 1 each) | Total (₹) |
Milk + Mango | 4 + 2 | 6 |
Milk + Apple | 4 + 1 | 5 |
Mango + Apple | 2 + 1 | 3 |
Step 3 – Match each hour's revenue. A woman sells at most one unit of each product per hour, and only Ganga may sell Mango smoothies. In Hour 4 the revenue also includes the leftovers.
Hour | Ganga | Kaveri | Narmada |
1 | 23 = MS + AS or AS + FS | 19 = MF | 31 = MF + FS |
2 | 21 = AS + BS | 22 = BS + FS | 21 = AS + BS |
3 | 29 = BS + MF | 30 = AS + MF | 23 = AS + FS |
4 | 30 = MS + FS (24) + Milk & Mango (6) | 27 = AS + BS (21) + Milk & Mango (6), or BS + FS (22) + Milk & Apple (5) | 22 = MF (19) + Mango & Apple (3) |
For example, Narmada's Hour 1 revenue of 31 can only be 19 + 12 (MF + FS), and Kaveri's Hour 1 revenue of 19 can only be MF. Ganga's Hour 1 revenue of 23 can be 12 + 11 (MS + AS) or 11 + 12 (AS + FS).
This question
Woman | Milk used in products | Leftover milk | Total milk |
Ganga | Hour 1: 2 or 1; Hour 2: 2; Hour 3: 2; Hour 4: 1 (MS) | 1 | 8 or 7 |
Kaveri | Hour 1: 1; Hour 2: 1; Hour 3: 2; Hour 4: 2 or 1 | 1 | 7 or 6 |
Narmada | Hour 1: 1; Hour 2: 2; Hour 3: 1; Hour 4: 1 | 0 | 5 |
Total | 18, 19 or 20 |
So the total milk at the start was 18, 19 or 20 units.
Hence, the answer is option 2.
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