How many kilograms of rice cost Rs. 60 per kg? must be mixed with 26 kg. of rice costing Rs. 42 per kg. so that there may be a gain of 12% by selling the mixture at Rs. 56 per kg.?
Solution SP = 56 per kg profit% = 12 
Then CP = 56×100/112 CP = 50 per kg 
1 0.5 3 7.5 21.5 74.25
25 13.5 12.5 20.75 39.5 ? 302.25
...3, 2, 3, 8, 31, ?
10, 22, 46, ?, 130, 190
[(288)2 ÷ 96 × ?] ÷ 44 = 432
-3 -10 -40 -185 -905 -4500
-4 a b c d e
Find the value of d.
...12 11 21 62 ? 1234
14, 7.5, 8.5, 14.25, 30.5, ?
19 8 ? -14 63 - 36
...What will be the next number in the series?
2, 7, 23, 70, ?
