Mathematical Reasoning
Two apples weigh the same as five mandarins.
Question 1 · Multiple choice
Question
Two apples weigh the same as five mandarins.
Bag X: 10 apples and 10 mandarins Bag Y: 4 apples and 25 mandarins Bag Z: 14 apples and 5 mandarins
Which statement is correct?
Options
- A.All three bags weigh the same.
- B.X and Y weigh the same; Z is different.
- C.X and Z weigh the same; Y is different.
- D.Y and Z weigh the same; X is different.
- E.All three bags have different masses.
Correct answer
Explanation
Step 1: Create a common unit
We are told: 2 apples = 5 mandarins
Let 1 mandarin = 2 units (an arbitrary unit of weight).
Then 5 mandarins = 5 × 2 = 10 units.
Since 2 apples = 5 mandarins = 10 units:
1 apple = 10 ÷ 2 = 5 units
Step 2: Calculate the weight of each bag
Bag X: 10 apples + 10 mandarins
= 10 × 5 + 10 × 2 = 50 + 20 = 70 units
Bag Y: 4 apples + 25 mandarins
= 4 × 5 + 25 × 2 = 20 + 50 = 70 units
Bag Z: 14 apples + 5 mandarins
= 14 × 5 + 5 × 2 = 70 + 10 = 80 units
Step 3: Compare
| Bag | Weight |
|---|---|
| X | 70 units |
| Y | 70 units |
| Z | 80 units |
X and Y are equal; Z is heavier.
Answer: X and Y weigh the same; Z is different