exam Maths Puzzle Numerical Ability

The radius of a circular mirror is 42 centimeters. Estimate the circumference of the mirror. C= 2pi r

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exam Other Question

A lidless box is constructed from a square peice of tin by cutting a 10cm square from each corner and bending up the sides for the box. If the volume of the box is 1200cm cubed, find the dimensions to the nearest tenth of a centimetre. CAN SOMEONE CHECK THIS PLEASE?
FUNGICIDES ACCOUNT FOR 1/10 OF THE PESTISIDE USED IN THE USA. INSECTICIDES ACCOUNT FOR 1/4 WRITE RATIO TO THE SIMPLEST FORM.

1/10 DEVIDED BY 1/4
= 1/40