Another maths question.
17 September 2015, 03:29 PM
#1
Another maths question.
Try this one, then.
A rabbit and a cat together weigh 10 kg
The rabbit and a dog together weigh 20 kg.
The cat and the dog together weigh 24 kg.
What would be the weight of the three together?
(Disclaimer: "weight" ought, really, to read "mass".)
A rabbit and a cat together weigh 10 kg
The rabbit and a dog together weigh 20 kg.
The cat and the dog together weigh 24 kg.
What would be the weight of the three together?
(Disclaimer: "weight" ought, really, to read "mass".)
17 September 2015, 03:32 PM
#2
27
1. R + C = 10
2. R + D = 20
3. C + D = 24
Re-arrange 1:
C = 10 - R
Solve into 3:
10 - R + D = 24
D - R = 14
D = R+14
Solve into 2:
R + R + 14 = 20
2R = 6
R = 3
Solve back into 1:
3 + C = 10
C = 7
Solve back into 3:
7 + D = 24
D = 17
Total :
17 + 7 + 3 = 27
1. R + C = 10
2. R + D = 20
3. C + D = 24
Re-arrange 1:
C = 10 - R
Solve into 3:
10 - R + D = 24
D - R = 14
D = R+14
Solve into 2:
R + R + 14 = 20
2R = 6
R = 3
Solve back into 1:
3 + C = 10
C = 7
Solve back into 3:
7 + D = 24
D = 17
Total :
17 + 7 + 3 = 27
Last edited by SJ_Skyline; 17 September 2015 at 03:36 PM.
17 September 2015, 03:34 PM
#3
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Cat weighs 7kg
Rabbit weighs 3kg
Dog weighs 17kg
Total is therefore 27kg
Cheers
Steve
18 September 2015, 08:06 AM
#9
In hindsight I would go with F1's answer as that's by far the most simple, but I'll take an extra point when offered.
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