From the picture above, if A + B = 8 (horizontally) and A + C = 13. Using other information that can be deducted from the picture, what is the value for A, B, C and D?
A + B = 8 (eqn i) C - D = 6 (eqn ii) A + C = 13 (eqn iii) B + D = 8 (eqn iv)
From eqn i: B = 8 - A (eqn v)
From eqn iii: A = 13 - C (eqn vi)
Put eqn vi into eqn v: B = 8 - 13 + C B = -5 + C B = C - 5 (eqn vii)
From eqn ii: C = 6 + D (eqn viii)
Put eqn viii into eqn vii: B = 6 + D - 5 B = 6 - 5 + D B = 1 + D (eqn ix)
From eqn iv: D = 8 - B (eqn x)
Put eqn x into ix: B = 1 + 8 - B B + B = 1 + 8 2B = 9 B = 9 ÷ 2 B = 4.5
From the picture above, if A + B = 8 (horizontally) and A + C = 13. Using other information that can be deducted from the picture, what is the value for A, B, C and D?
A + B = 8 (eqn i) C - D = 6 (eqn ii) A + C = 13 (eqn iii) B + D = 8 (eqn iv)
From eqn i: B = 8 - A (eqn v)
From eqn iii: A = 13 - C (eqn vi)
Put eqn vi into eqn v: B = 8 - 13 + C B = -5 + C B = C - 5 (eqn vii)
From eqn ii: C = 6 + D (eqn viii)
Put eqn viii into eqn vii: B = 6 + D - 5 B = 6 - 5 + D B = 1 + D (eqn ix)
From eqn iv: D = 8 - B (eqn x)
Put eqn x into ix: B = 1 + 8 - B B + B = 1 + 8 2B = 9 B = 9 ÷ 2 B = 4.5
From eqn x: D = 8 - 4.5 D = 3.5
From eqn viii: C = 6 + 3.5 C = 9.5
From eqn vi: A = 13 - 9.5 A = 3.5
Answer: A = 3.5, B = 4.5, C = 9.5, D = 3.5
BY Riddles Repository - Answers
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Bitcoin is built on a distributed digital record called a blockchain. As the name implies, blockchain is a linked body of data, made up of units called blocks that contain information about each and every transaction, including date and time, total value, buyer and seller, and a unique identifying code for each exchange. Entries are strung together in chronological order, creating a digital chain of blocks. “Once a block is added to the blockchain, it becomes accessible to anyone who wishes to view it, acting as a public ledger of cryptocurrency transactions,” says Stacey Harris, consultant for Pelicoin, a network of cryptocurrency ATMs. Blockchain is decentralized, which means it’s not controlled by any one organization. “It’s like a Google Doc that anyone can work on,” says Buchi Okoro, CEO and co-founder of African cryptocurrency exchange Quidax. “Nobody owns it, but anyone who has a link can contribute to it. And as different people update it, your copy also gets updated.”
