Juan ate 15 grapes in 30 seconds at this rate how long should it take him to eat 85 grapes

85 / 15 = 5 2/3
30 x 5 = 150
2/3 x 30 = 20
The answer is 170 seconds, or 2 minutes and 50 seconds

15grapes/30seconds=85grapes/(x)seconds
15(times)x; 85×30
15x=2550
2550÷15=170seconds or 2 minutes & 50 seconds

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post

Answer is a not really sure tho