exam Maths Puzzle Numerical Ability

B4

Find the total surface area and volume of each solid object. Round to the three significant digit.

the object is a frustums of cone (frustums)

top radius:4.5'
height

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exam Other Question

please help me solve this equation: 21/15-3x<0 Brett usually takes 50 minutes to groom the horses. After working 10 minutes, he was joined by Angela and they finished the grooming in 15 minutes. How long would it have taken Angela working alone? Please explain the steps and the equation used. Thanks.