how many gallons of water did a truck fill up if it's weight before the fill up was 3547 lbs and afterwards was 4924 lbs?

depending on the method, 138-139 (imperial) gallons, or 626 L

Explanation:

The wt of water is 4924-3547 lb = 1377 lb = 1377/2.2 kg = 626 kg = 626 L

1gallon = 4.5 L (it does where I come from and who still measures things in imperial anyway?) so I guess  that is 139 gallons

or alternatively, I recall from distant childhood, “a pint of water weighs a pound and a quarter” which means 1 gallon = 10 lb, so 1377 lb = ~138 gallons

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6