5w - 15 = 25 what is w

On average, how many more hits will he get when he bats 100 times at home during the day as opposed to 100 times away at night?

Scarlet bought three pairs of sunglasses and two shirts for $81 and paula bought one pair of sunglasses and five shirts for $105 what is the cost of one pair of sunglasses and one shirt?

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?