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7-31) What is the value of x3 y + 4x + 3y, when x = 6 and y = 7?

7-32) What is the value of xyz + z1/2 + x3y + (x +y)2, when x = 3, Y = 7 and z = 9?

7-33) Ed and Alysa make 1 gallon of lemonade each. Ed's lemonade has a water to lemon juice ratio of 3:1. Alyssa's lemonade has a water to lemon juice ratio of 4:1. They decide to mix the 2 gallons of lemonade together in a larger container. What is the water and lemon juice ratio at the end?

7-34) Soma the dog runs along a railroad. A train that is 270 meters long passes her in 18 seconds. The speed of the train is 20 meters per second. What is Soma's speed?

7-35) A truck was transferring fertilizer. The first day, it transferred 2/5 of the entire pile of the fertilizer. The second day it transferred 3/4 of the remaining of the fertilizer. There are 1200 pounds of fertilizer left. How much fertilizer was there before the transferring?

More challenging math problems for seventh grade:
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61-70
71-80  81-90