one pump fills a tank 2 times as fast as another pump. if the pump work together, they fill the tank in 8 minutes. How long does it take for each pump to fill the tank?

Step-by-step explanation:

if one pump = x

the other pump = 2x

therefore

x + 2x = 8 minutes

3x = 8 minutes

Divide through by 3

x = 8/3 minutes

converting it to seconds

x = 8/3 * 60

x = 160 seconds

therefore

the first pump = 2x = 2 * 160 = 320 seconds

the second pump = x = 160 seconds

hello from mrbilldoesmath!

answer:

a(n) - a(n-1) -3

discussion:

this ones a bit interesting. given a(n) = 5 - 3n consider this:

a(n-1) = 5 - 3(n-1)

          = (5 - 3n) + 3             => but a(n) = 5 - 3n, the first term

          = a(n)   + 3                 => subtract 3 from both sides

a(n-1) -3 = a(n)  

or

a(n) - a(n-1) -3

you,

mrb

lol we need to see what the question is asking about

step-by-step explanation: