Question
What is the fourth proportion of 18, 22 and
27?Solution
We know the formula to find the fourth proportion - => a : b = c : d => 18 : 22 :: 27 : d => d = (27 × 22)/18 => d = 33
The average age of a class of 20 girls is 14 years. If 5 new girls having average age of 9 years join the class, then the average age of the class becomes:
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