Answer:
$25
Step-by-step explanation:
Say the value of 1 skateboard is x. We can make an equation. 15*6+2x=4*15+5x. 90+2x=60+5x. We can subtract 60 and 2x from both sides to get 30=3x. x=10. The cost of 1 skateboard is 10, so to rent one skateboard and one bike it costs 15+10=$25