Asked by Rezu

Three ducks and two ducklings weigh 32 kg. Four ducks and three ducklings weigh 44kg. All ducks weigh the same and all ducklings weigh the same. What is the weight of two ducks and one duckling?
20kgs?
Answered by Damon
3 D + 2 d = 32
4 D + 3 d = 44

multiply first by 3, second by 2

9 D + 6 d = 96
8 D + 6 d = 88 subtract
----------------
D = 8
so 3*8 + 2 d = 32
2 d = 8
d = 4
so
2(8) + 1(4) = 20
Answered by Rezu
Thank You!
Answered by azhany
omg this is so useful thanks a lot
Answered by Eva
Why would you multiply it by two or three though?
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