exam Maths Puzzle Numerical Ability

solve for x:

x over 60 =3 over 20

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exam Other Question

many likes to buy two different kinds of strings for the guitar . the slinky costs $3.50 for each set and the slippys cost $4.50 for each set. how many of the slippys did he buy if he spent $41 ona total of $10 sets of strings. Find the product: (3x+0.4)(3x-0.4)