Hi, could someone help me to solve this? 
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n = MV
where,
n = number of moles
M = molarity
V = volume
First, we find the total number of moles after combining both solutions.
Note that 1 dm3 = 1000 cm3.
Total n = 1001/1000 + 504/1000 = 0.3 moles
Total volume = 100 + 50 = 150 cm3
New molarity, M = n/V = 0.3/(150/1000) = 2 mol/dm3
Owhh thanks a lot!