This one you can't really make a formula for or anything, but it's fairly simple to figure out, with a bit of guess and check. 14 is really close to 15, but that's bigger, so let's try a smaller number that would work. It has to be divisible by 2, because you've got a whole number that is 3 1/2 times the other number. (1/2 of a whole number means it's divisible by 2). 10 is divisible by 2, 10 ÷ 2 = 5 But, 10 x 3 = 30 which is much bigger than 14. So, we've got to start with a smaller number. Let's try something really small, like 4. We could try 2, but 2 x 3 = 6, which, even with 1/2 of 2, isn't nearly close to 14. Now, 4 x 3 = 12 That's quite close to 14. And 1/2 of 4 is 2. All we do now is add 12 to 2 and see if it works. 12 + 2 = 14 14 = 14 This one works. That means that Gina volunteered for 4 hours, because 3 1/2 x 4 = 14.
in the urban ecosystem, the air is always is so much pollute, the waters too are always so much polluted hence not so much good for non human life. but in the undeveloped forest ecosystem, the air is so much fresh, the environment and the waters too hence find it better in the place.
