Maths question year 9 help!?

Maths question year 9 help!?



Please help I have a maths test tomorrow and I'm very confused! 

Third generation fibre optics that can carry up to 10 trillion (1*10^12) bits per second down a single strand of fibre have been recently tested. Currently the amount that one fibre can carry is tripling every 6 months and is predicted to do so for the next 20 years. In how many years will it take for the amount of bits per second being carried down a single strand of fibre exceed 6*10^16 bits per second. Explain, in detail, your solution process.





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