There are 50 total marbles in the bag and 26 of them are red or blue (19 Red + 7 Blue). You find the probability of them by dividing the number of red and blue marbles by the total marbles. (26/50) That's almost half and is specifically 0.52. To change it to a percent, you move the decimal 2 spaces giving you D. 52%
I just kind of sat here playing with numbers i dont really know a shortcut but the answer is 10 chickens and 15 rabbits 10*2= 20 each chicken has two legs so thats 10 heads 20 legs 15*4=60 each rabbit has four legs so thats 15 heads 60 legs 15+10=25 heads 20+60=60 legs
