Samuel has 20 blue envelopes. He has 5 fewer yellow envelopes than blue envelopes. He has 4 times as many green envelopes as yellow envelopes. How many envelopes does Samuel have in all?

Donald bought 5 packs of red bouncy balls, 10 packs of yellow bouncy balls, and 6 packs of green bouncy balls. There were 8 bouncy balls in each package. How many bouncy balls did Donald buy in all?

Trixie and Mandy are comparing their grocery shopping. For every red apple Trixie has, she has four green apples. For every red apple Mandy has, she has three green apples. Trixie and Mandy have 20 apples each. How many more green apples does Trixie have compared to Mandy?

A bag contains a number of small balls.  1/4 of the balls are green, 1/8 are blue, 1/12 are yellow and the remaining 26 white. How many balls are blue?

Each marble bag sold by Carmen's Marble Company contains 4 yellow marbles for every 3 orange marbles. If a bag has 20 yellow marbles, how many orange marbles does it contain?

In Leah's classroom there are red chairs, yellow chairs, and blue chairs. There are 8 red chairs. There are 4 times as many yellow chairs as red chairs, and there are 6 fewer blue chairs than yellow chairs. How many chairs are there in Leah's classroom?