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The sixth grade math is 1. The sum of the sides of a cuboid is 152 cm, and the length-width ratio is 8: 6: 5. What is the volume of this cuboid?
1, and the sum of length, width and height is: 152÷4=38 cm.

8+6+5= 19

Length: 38×8/ 19= 16 cm.

Width: 38×6/ 19= 12 cm.

Height: 38×5/ 19= 10 cm.

The volume is:16×12×10 =1920cm2.

2. It must be an isosceles triangle.

4+3+3= 10

The top angle is: 180×4/ 10=72 degrees.

Both base angles are: 180×3/ 10=54 degrees.

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