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Question 37

Fill in the blanks to make the statements true.

There is a  number in the box such that, , 24, 9, 12 are in proportion.
The number in the box is ___.


Solution

Let the number in box be x

Then x, 24, 9 and 12 are in proportion.
x:24::9:12
x24=912           [ If a, b, c and d are in proportion, then ab=cd]
 x×12=24×9       [by cross multiplication]
 x=24×912 x=2×9 x=18
The number in the box is 18.

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