The answer is: [C]: "30%" . _____________________________________________________ Explanation: _____________________________________________________ Note that: "%" ; or "percent" means "out of 100" ; or "divided by 100" . ______________________________________________________ Method 1)
15/50 = ?/ 100 ;
Look at the denominators:
50 * (what value?) = 100 ? ; → "100 ÷ 50 = 2" ;
→ 50 * 2 = 100 ;
So: "15/50 = (15*2)/(50*2) = "30/100" ; which is "30%" . ___________________________________________ Method 2: ___________________________________________ "15/50" = (15÷5) / (50÷5) = 3/10 ;
3/10 = (3*10) / (10*10) = 30/100 ; which is: "30%" . __________________________________________ Method 3: (slight variation of "Method 2" above): ___________________________________________ "15/50" = (15÷5) / (50÷5) = 3/10 ;
Answer: Electrons in water act in a similar way to visible light so they don't absorb or reflect most of the light. Instead they allow it to pass through relatively unimpeded, absorbing wavelengths like infrared and reflecting invisible UV
