Question
The average height of each student in a class of 15
students is 160 cm. If 6 new students joined the class, then the average height of the each student in the class increases by 4 cm. Find the average height of 6 new students who joined the class.Solution
Total height of 15 students of the class = 160 × 15 = 2400 cm When 6 new students joined the class, average height of each student = 160 + 4 = 164 cm Total height of 31 students of the class = 164 × 31 = 3444 cm Average height of 6 new students who joined the class = {(3444 – 2400)/6} = 1044/6 = 174 cm
254, ?, 1022, 1150, 1214, 1246
80, 120, 30, 45, 9, 13.5, ?
252, 128, 66, 35, 19.5, ?
1029, 1030, 1039, 1064, ?, 1194
What will come in place of the question mark (?) in the following series?
28, 45, 75, 118, 174, ?1     1      4       ?      280       3640
...230 192 172 ? 122 100
...- What will come in place of the question mark (?) in the following series?
6, 6, 9, ?, 32, 56 What value should come in the place of (?) in the following number series?
5670, 1620, 540, 216, 108, ?
What will come in place of the question mark (?) in the following number series?
124, 131, 117, ?, 110, 145
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