What comes next in the series - 25 : 105 :: 55 : ?
231
Look for a rule that turns 25 into 105. Multiplying by 4 gives 100, and adding one-fifth of the number (25 ÷ 5 = 5) gives 100 + 5 = 105.
So the rule is: first number × 4 + (first number ÷ 5), which is the same as multiplying by 21/5.
Apply it to 55: 55 × 4 = 220 and 55 ÷ 5 = 11, so 220 + 11 = 231.
Check: 55 × 21/5 = 11 × 21 = 231.
Hence, 231.
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LSQG : PWMC : : THZS : ?
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