Answer:
b
Step-by-step explanation:
8 boards.
Since he bought a few of each length. The only combination that works is when he bought 5 of the 4 ft long board so 4×5=20. Than he bought 3 of the 5ft boards 3×5=15. 20+15=35 ft worth of boards.
1/10
93÷93 930÷93
=1/10