Question
Owen, David and Liam have some erasers. The ratios of their erasers are as follows:

Owen : (Owen + David + Liam) = 2 : 5
David : (Owen + Liam) = 1 : 5

Liam has 80 erasers more than David. In the end, Liam gives away all he has to David and Owen so that both David and Owen end up with the same number of erasers, how many erasers has David received from Liam?
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Owen, David and Liam have some erasers. The ratios of their erasers are as follows:

Owen : (Owen + David + Liam) = 2 : 5
David : (Owen + Liam) = 1 : 5

Liam has 80 erasers more than David. In the end, Liam gives away all he has to David and Owen so that both David and Owen end up with the same number of erasers, how many erasers has David received from Liam?