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One - One function

If 3 + 9 = 31...

Question

If 3 + 9 = 31; 15 + 12 = 45; 18 + 9 = 36, then 12 + 27=?

A

94

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B

14

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C

49

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D

53

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E

72

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Solution

The correct option is A 94
The rule is: Divide each number by 3 and write the quotients in the reverse order.
$\frac{3}{3} + \frac{9}{3} = 13 \Rightarrow 31; \frac{15}{3} + \frac{12}{3} = 45;$
$18 + 9 = \frac{18}{3} + \frac{9}{3} = 63 \Rightarrow 36 e t c .$
$∴ \frac{12}{3} + \frac{27}{3} = 49 \Rightarrow 94.$

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Prepare a frequency distribution by inclusive method taking class interval of 7 from the following data:

28	17	15	22	29	21	23	27	18	12	7	2	9	4
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(iv) (−15) × (−14) + (−15) × (−6)
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