exam Maths Puzzle Numerical Ability

Find the unit rate?

$42 at 5 compact discs ?

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exam Other Question

HERE IS A QUESTION THAT i AM COMPLETELY LOST ON, I HAVE NO CLUE WHERE TO START OR HOW TO CALCULATE THIS, CAN SOMETIME GIVE IT A TRY?/ i WOULD REALLY APPRECIATE IT, iF i DO NOT RE how do i solve this x2/2+2/7=-2x/7