book Maths Puzzle Numerical Ability

Please tell me
"what is the Formula for the volume of a solid Trapezium?"

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book Other Question

I have $100 to purchase 100 animals. Their cost is.....

Chickens = $0.50
Goats = $3.50
Sheep = $10.00

How many of each animal is purchased to reach the 100 animals required 4s-12=-5s+51