If L1 ∥ L2 , and L3 ∥ L4 , what is the measure of ∠1? Please help me

If 20% of a number is 35, what is 50% of that number?

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?

Louise measured the perimeter of her rectangular scrapbook to be 154 cm. if the scrapbook is 45 cm wide, how long is the scrapbook?