Hello! Does anyone know what the equation is to solve this? I don't Exactly need the answers, I just need to know how to solve these: 10% of what number is 14?
25% of what number is 21?
15% of what number is 12?
140% of what number is 35?
125% of what number is 25?
Have a good day everyone, thanks!

Without any equipment, you can see stars that are 2{,}800{,}0002,800,0002, comma, 800, comma, 000 light-years away. by looking through a small telescope, you can see stars that are 3{,}112{,}000{,}0003,112,000,0003, comma, 112, comma, 000, comma, 000 light-years away. approximately how many times as far can you see using a small telescope as without any equipment?