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The first diagonal-x
The second diagonal-y

because it says one diagonal is twice the other
The sum of the length of the diagonals is 24. Therefore substitute the value of y.
Add like terms
Divide both sides by 3

Therefore the first diagonal is 8 and the second is 16. Now the formula for the area of the rhombus given its diagonals is:
Substitute the diagonals
A=64 sqr. units

The area is 64 sqr. units. Hope this helps =)
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