Question
An alloy of copper and tin contains 65% of copper. If 12
kg of more tin is added to the alloy, the copper content gets reduced to 50%. Find the quantity of the new alloy.Solution
Ratio of copper to tin in the alloy = 13:7 Let the quantity of copper and tin in the alloy be 13x kg and 7x kg, respectively. According to question, 13x = 7x + 12 x = 2 kg So, the quantity of new alloy = 13x + 7x + 12 = 20x + 12 ⇒ 40 + 12 = 52 kg
Find the wrong number in the given number series.
7, 14, 29, 58, 117, 233, 469
1, 1.5, 3, 7.5, 22.5, 75, 315
In each of the following, one term is wrong. Find the WRONG term.
7, 15, 29, 58, 117, 235
Find the wrong number in the given number series,
121, 130, 116, 139, 103, 148
- Find the wrong number in the given number series.
3, 6, 10, 15, 21, 29 121, 118, 122, 115, 127, 112
1024Â Â 3072Â Â Â 384Â Â Â 1152Â Â Â 145Â Â Â 432
Find the wrong number in the given number series.
15, 19, 36, 99, 355, 1379Â
2, 10, 30, 64, 130, 222
Find the wrong number in the given number series.
3, 7, 22, 89, 445, 2675
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