You have to know the patterns in order to answer certain questions. for your question you have to figure out all the missing angles. in the triangle the missing angle would be 85... then you take that right angle, divide by two which is 45... therefore x is 45
now using the x pattern we know that the inside angle is 95... and the angle beside the 108 is 72 (180-108=72)...because x is 45 you add all the numbers you know and subtract by 360 because its a four sided shape. therefore y is 148