Out of 40 coins, 16 are dimes. half of the remaining coins are quarters and the rest are pennies and nickels. there are 2 nickels for every penny. how many pennies are there?

Create and solve a linear equation that represents the model, where squares and triangles are shown evenly balanced on a balance beam. assume the weight of a square is 1 unit and the weight of a triangle is unknown.

I’m stuck on this equation, anyone got the answer?

Anumber cube is rolled two times in a row. find the probability it will land on 2 on the first roll and a number greater then 4 on the second roll