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The IQ question is,

(39+56)/60% = ?*3

Complete the equation by correctly identifying the missing part of the calculation from the list of options below.

where in the book answer is stated as 133/7.

I calculated the answer using base 10 but it doesn't produce the given answer. Any insight?

This was extracted from ADVANCED IQ TESTS by PHILIP CARTER

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So

(39+56) = 95; and 95/60% = 95/0.6 = 158.333 repeated.

Then,

You have 3x = 158.333333 = 475/3, so x = 158.33333 /3 = 475/9.

However,

Notice that 133/7 = 19. There’s a typo in the book, since 19 x 3 = 57, and (39+56)x60% = 57. The true question should have been (to get their answer): (39+56)x60% = ?x3.

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    $\begingroup$ This real solution demonstrates a general-purpose intelligence well beyond the calculation skill that the book seems intent to measure. $\endgroup$
    – humn
    Jul 9, 2020 at 5:48
  • $\begingroup$ Thank you, @humn! Too kind :) $\endgroup$
    – El-Guest
    Jul 9, 2020 at 11:14
  • $\begingroup$ Thank you @El-Guest and @humn! $\endgroup$
    – Lakshitha Wisumperuma
    Jul 9, 2020 at 16:00

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