25 probability question.

this is from math-a-thon, pls solve this problem to me children with

destructimous has 7 sonic blasts and 13 heat rays. it also has a 2/7 chance of using its ultra power blast. luckily, octagon’s sheild reflected that blast and stopped all the robots. how many ultra power bots did destructimous have? pls show/ explain your work. (i know the answer i just dont know how to find it).

Kevin has a spinner that has 10 equal sections and 2 sections of each color—red, blue, green, yellow, and purple. kevin spins the spinner 180 times. kevin determines about how many times the spinner will land on red or green, and his work is shown below. -kevin has the formula reversed; it should be the total number of sections over the number of red or green sections. -kevin should have used a 4 in the numerator because there are 2 red sections and 2 green sections. -kevin should multiply by the number of sections in the spinner rather than the total number of spins. -kevin calculated the prediction correctly and did not make any mistakes.