Question
If 35 grams of sugar is further added to a 20 percent
sugar solution, the solution then becomes a 36 percent sugar solution. What was the initial quantity of sugar in the solution?Solution
Let the initial quantity of sugar in the solution be x grams. 
So, 1 ------- 35 => 4 ------- 35 × 4 = 140 Initial quantity of sugar in the solution = x = 20% of 140 = 28 gms
What should come in place of (?) question mark in the following number series.
4, 9, 19, 34, 54, ?
?, 15, 45, 225, 1575, 14175
62, 87, 137, ?, 312, 437
In each of the following number series, one term is missing. Find the missing term.
2, 6, 12, 20, ?, 42
A series given below follows a certain pattern,
1800, 469, (?), 855, 980, 953
If (?) = B – 2, then find the nearest cube root of B.
What will come in place of the question mark (?) in the following series?
9, 22, 61, ?, 217, 334
129, 224, 355, 528, ?, 1024
289    169      121       ?      25       9
...18, 30, 46, 66, 90, ?
Find the next term in the series:
3, 10, 21, 36, 55, ?
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