30 square feet.
2 x 5 is 10. 4 x 2 is 8. 10 + 8 = 18. If you look at where the two is at the top and make a line above it’s in half. So it would add 2 more to the four in the second box. So 6 x 2 = 12. And 18 + 12= 30.
