exam Maths Puzzle Numerical Ability

4 1/5 X 10/21 X 9/20=
Please show me how to multiply fraction if you could? The only whole number is the (4) in the first prblem. THANKS

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exam Other Question

The wheel of a truck is turning at 6 revolutions per second. The wheel is 4 feet in diameter.

A. Find the angular velocity of the wheel in radians per second.
B. Find the linear velocity in feet per second of a point on the rim of the wheel. Find the constant of variation k.
m varies directly with n; m=144 when n=8.
This is what I have; m=kn (144)=k8 k=18
Am I close on this at least a little? Thank you for your help.

Barb Neely