B) 24
C) 30
D) 44
Description for Correct answer:
21 : 18 :: 42 : x
=> x = (<span id="MathJax-Element-2-Frame" class="MathJax" style="box-sizing: border-box; display: inline; font-style: normal; font-weight: normal; line-height: normal; font-size: 15px; text-indent: 0px; text-align: left; text-transform: none; letter-spacing: normal; word-spacing: normal; overflow-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;" tabindex="0" role="presentation" data-mathml="42×1821“>42×18)/21 = 36
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