If there is a bench at first and every fourth sign after that.there is water at seconed sign and fifth after that. at which sign can i find both bench and water.
my answer is i subtract 4-1=3 and i subtract5-2=3 i added 3+3=6,so ami correct to say that wzater and bench will be at every six station
bench: 1 5 9 13 17 21 25 29 33 37
water: 2 7 12 17 22 27 32 37 42..
Your answer is not correct. Try sign 17.. or 37
or any 20th sign after that