exam Maths Puzzle Numerical Ability

Can u please help me solve this equation:

[2x-5 4y+3z] -7 31
=

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exam Other Question

Give the prime factorization of
66 and 336 Vito invested $500, part at 9% per annum, and the rest at 11% per annum. After one year, the interest earned on the 9% investment was $20 less than the interest on the 11% investment. How much did he invest at each rate?