(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

water fills a tank at a rate of 150 litres during the first hour, 350 litres during the second hour, 550 litres during the 3rd hour and so on. find the number of hours neccesary to fill a rectangular tank 16m x 7m x7m

2. Relevant equations

l=a+(n-1)d

S= n/2 (a+l)

where:

l = term

a = first no in series

n = nth term

d = common difference

S = sum

3. The attempt at a solution

volume of tank = 784

although it doesnt say i assumed 1m(3) is equal to 1000kg = 1000 litres

therefore water required to fill tank = 784,000 litres

a = 150

d = 200

what i dont understand is in either equation given for arithmetic progression there are 2 unknows?

the answer is 88.3 hours

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# Arithmetic progression Q

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