Answer to Q40
If A + B = 60 and A - B = 40, then what is A ÷ B?
A + B = 60 so, B = 60 - A
A - B = 40 so, A - (60 - A) = 40
A - 60 + A = 40
2A = 40 + 60 = 100
A = 100 ÷ 2 = 50
And, B = 60 - A = 60 - 50 = 10
So, A ÷ B = 50 ÷ 10 = 5
Answer: 5
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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.”
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