Cssa question 5 multiple choice?!?!??!! (1 Viewer)

[zb123]

Helen planted a bed of gardenias in rows on her commercial property. each row had to be fertilised before she started planting.

There were 13 gardenia plants in first row, 19 in 2nd, and so on. each succeeding row had 6 more gardenia plants than the row before it.

IF helen wanted to plant 1453 garenias, how many rows will shee need to fertilise.

a)20
b) 21
c)23.75
d)241

Answer is b... am i missing something here? I got 98% in my trial and am rank 1, so is this some sort of mistake? Is it just an AP sum??!!?!?!

 

[nerdasdasd]

Ap, the difference is 6

 

[zb123]

I know... but it doesnt work..

 

[iBibah]

Yes it does.



The reason we round up is because 20 rows will give a total of 1400 which is less than the required amount, so the next full row is 21, which gives 1533.

 

[zb123]

why 1454???

 

[iBibah]

why 1454???

Mistake, meant 3. Still the same answer though, just a typo.