Each time we add opposite numbers we get the same number which is 21, so if we add 15 + ? we must get 21, so the should replace the question mark by 6
Each time we add opposite numbers we get the same number which is 21, so if we add 15 + ? we must get 21, so the should replace the question mark by 6
RE: Maths Brain Teasers 66:: Can You Complete The Pie???