Dan wants to cover a space in the garden with gravel. He needs to buy 300 kg of gravel. A shop has this offer. Dan has a budget of pound 100

Answer 20 centimeters15+8=2323-3=20so the answer is 20 centimeters

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.