There are hens + rabbits. The heads = 50 the feet = 134. How many hens & how many rabbits ?

Flies + spiders sum 42 heads and 276 feet. How many of each class?

J received $1000 and bought 9 packs of whole milk & skim milk that totalled $960 - How many packs bought of each kind?

A number is composed of two integers and its sum is 9 if the order is inverted the result is equal to the given number plus 9 more units - find the number.

Determine 2 numbers such that the difference of its squares is 120 and the sum is 6.

If I have 30 coins of two kinds 5 cents and 1 cent can I have a total of 78?

A rectangle has a perimeter of 392 m calculate its dimensions if the length is 52 m longer than the width.