Denis bought 50 postage stamps for which she paid $13.00. Some were 20-cent stamps and some were-40 cent stamps. How many of each did she buy? (Please show work with Substitution or Elimination Method)

Helll ! 1,400 tons of wheat of two different varieties was delivered to the silo. when processing one variety, there was 2% of waste and 3% during the processing of the second variety of wheat. after the processing, the amount of remaining wheat was 1,364 tons. how many tons of each variety of wheat was delivered to the silo?

How many 3/8s are in 6 plz someone tell me now

The oates family went out for dinner the price of the meal was $33.95 the sales tax was 7.25% of the price of the meal . the tip was 15% of the meal and the sales tax . how much money did the oates family pay for the meal, including tax and tip