P can do a piece of work in 10 days. Q can do it in 16 days. With the help of R, they finish the work in 4 days. In how many days can R alone do the whole work?
2401 2402 1203 ? 105 26
102, 246, 442, 698, 1022, ?
12, 18, 28, 42, 52, ?
13 182 303 384 433 ?
108 329 ? 2975 8928 26789 .
29 46 65 88 ? 148
If 16 15 26 69 260 x,
Find 75% of x+ x
0.5 1.5 5 ? 76 385
2, 12, 36, 80, ?, 252
130 114 106 102 100 ?
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