3D - 2

i need these math questions.?

here is the questions:\/ 1.write a word problem that could be solved with the equation 3/4d=6 2.suppose you have a number,subtract 7,multiply by 3,add 6, and divide by 7.the result is 3.what is the original number? 3.write an equation to solve problem. lethal yellowing,a disease that kills palm trees,is moving across the caribbean islands at a rate of about 1 3/10 miles per month.how many months(m) will it take for the disease to spread a distance of 195mi? pleas show work on all of them!

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1. Jane can repair 8 lawnmowers in a day. If she takes off 1/4 of the day for a parent meeting at school, how many lawnmowers can she repair in the rest of the day? ((x - 7)*3+6)/7 = 3 3(x-7) + 6 = 21 3(x-7) = 15 (x-7) = 5 x = 12 1.3mi/mon * x mon = 195 mi x = 195/1.3 x = 150 months
2. The answer to #2 is 12
3. 1. take the number 3. divide it be 4 times an unknown number and the result is 6. what could the unknown number be? sorry if that sucks. i'm not good at them. 2. [3(x-7)+6]/7 = 3 3(x-7)+6 = 21 3(x-7) = 15 x-7 = 5 x = 12
4. Alright, I'm sorry i can't help out with the first and last, but the second is quite easy. All you have to do is go backwards. Take the result, 3, and go in reverse. Instead of dividing by 7, take the opposite and multiply by 7. This will give you 21. Now, subtract 6 and you get 15. Divide 15 by 3 and get 5. Add 7 and you end up with 12. 12 is the original number. 12-7=5. 5x3=15. 15+6=21. And 21/7=3. It's quite easy. If I wasn't pressed for time, I'd help you out on the other 2 but alittle too busy. Hope this helps.
5. 1) 75% of a basket of apples equals 6. How many apples are in the basket? 2)(((x-7)*3)+6)/7=3 ((x-7)*3)+6=21 (x-7)*3=27 x-7=81 x=88 3) rate x time = distance rate 1 3/10 time m distance 195 1 3/10 * m = 195 m = 195 / (1 3/10) m = 150