Question

The mass of Box A and Box B is 0.6 kg. The mass of Box A and Box C is 1.3 kg.

Box C is 3 times as heavy as Box B. Find the mass of Box A.
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Answer 1

A=0.25

B=0.35

C=1.05

Explanation:

1. A+B=0.6

2. A+C=1.3

3. C=3B

2 subtract 1:

• C-B=0.7

3 substituted:

• 3B-B=0.7
• B=0.35
• C=0.7+0.35=1.05
• A=0.6-0.35=0.25