Unable satisfy constraints when changing multiplier in constraintWithItem - iphone

Question

I'm trying to get my container view working. The problem is when changing the multiplier to something diffrent than 0.5 I get :
Unable to simultaneously satisfy constraints.
for example, If I change *c2 multipier to 0.4 and *c8 to 0.6 I get the above error. But if I change back to 0.5 it´s all fine. What am I doing wrong here?
I got some more constraints but they are for vertically layout so I don´t think they are the problem.
NSLayoutConstraint *c1 = [NSLayoutConstraint constraintWithItem: contentView
attribute: NSLayoutAttributeLeft
relatedBy: NSLayoutRelationEqual
toItem:self.view
attribute:NSLayoutAttributeLeft
multiplier:1.0
constant:0.0];
NSLayoutConstraint *c2 = [NSLayoutConstraint constraintWithItem: contentView
attribute: NSLayoutAttributeWidth
relatedBy: NSLayoutRelationEqual
toItem:self.view
attribute:NSLayoutAttributeWidth
multiplier:.4
constant:0.0];
// detailView
NSLayoutConstraint *c7 = [NSLayoutConstraint constraintWithItem: detailView
attribute: NSLayoutAttributeRight
relatedBy: NSLayoutRelationEqual
toItem:self.view
attribute:NSLayoutAttributeRight
multiplier:1.0
constant:0.0];
NSLayoutConstraint *c8 = [NSLayoutConstraint constraintWithItem: detailView
attribute: NSLayoutAttributeWidth
relatedBy: NSLayoutRelationEqual
toItem:self.view
attribute:NSLayoutAttributeWidth
multiplier:.6
constant:0.0];

Answer 1

I had success using relatedBy:NSLayoutRelationGreaterThanOrEqual.
For eg :
[self.view addConstraint:
[
NSLayoutConstraint
constraintWithItem: _accountRegisteredDateLabel
attribute:NSLayoutAttributeWidth
relatedBy:NSLayoutRelationGreaterThanOrEqual
toItem:self.view
attribute:NSLayoutAttributeWidth
multiplier:.30
constant:0
]
];

Answer 2

I thought that I would answer my own question.
I ended up setting one views multiplier to 0.609375 and the other one to 0.390625
That worked great for me!
Why it failed with 0.4 and 0.6 was because it didn't add up with the total space.
My two views were going to be next to each other with a total space of 1024px(ipad).
0.4 * 1024 = 409,6
0.6 * 1024 = 614,4
My understanding is that somehow the constraintWithItem method not care about the remainders and throw an error.
So just come up with a number that doesn't give you any remainders
0.390625 * 1024 = 400
0.609375 * 1024 = 624