exam Maths Puzzle Numerical Ability

A collection of 102 nickels, dimes and quarters is worth $13.60. There are 14 more nickels than dimes. How many quarters are there?

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HELP!: 30 identical cylindrical cans of fruit juice of radius 3cm and height 12cm are arranged in 6 rows of 5 each and packed in a rectangular box.
Calculate the amount of empty space in the box. ( Use pi-3.14) I need some help to evaluate logv10 100

**the v is the opposite of ^*** if that makes any sense1