50 g = ~1.764 ounces.
180 grams is about 207 ml (7 ounces).
200g is the same as 7oz
130 grams is roughly 4.6 oz by weight. Since a cup of flour typically weighs between 4 and 5 ounces (depending on your cup-filling technique) you could just call 130 grams a cup.
well, if you are using butter, 55 grams in 1/4 cups, so it should be pretty close to 1/4 cups