Question
The cost of 2 pencils, 4 pens, and 8 erasers is Rs. 24
and the cost of 8 pens, 10 pencils, and 4 erasers is Rs. 36. How much will 3 pencils, 3 pens, and 3 erasers cost?Solution
2 pencils+ 4 pens + 8 erasers =24         … (1) 10 pencils+8 pens+4 erasers =36          … (2) Adding Eq (1) and (2) … 12pencils +12 pens +12 erasers =36+24=60 12(1 pencil +1 pen +1 eraser) =60 (1 pencil +1 pen +1 eraser) =5 (3 pencil +3 pen +3 eraser) =5×3=15 (3 pencil +3 pen +3 eraser) =15.
5, 12, 24, 36, 52, ?
161Â Â Â Â 173Â Â Â Â Â Â 191 Â Â Â Â Â Â 215Â Â Â Â Â Â 245 Â Â Â Â Â Â ?
...81 72 136 111 ? 278
...8Â Â Â 8Â Â Â 12Â Â Â 24Â Â Â Â 60Â Â Â Â Â ?
12, 36, 80, 164, 328, ?
10, 94, 115, 138, 163, ?
Find the missing number in the given number series.
130, 152.5, 177, 203.5, 232, ?Â
65, 90, 140, ?, 315, 440
562, 628, 698, ?, 850
64Â Â Â Â 32Â Â Â Â Â Â 32 Â Â Â Â Â Â 48Â Â Â Â Â Â 96 Â Â Â Â Â Â ?
...
