Which two signs should be interchanged to make the following equation correct?
36 ÷ 48 × 16 + 8 – 40 = 76
36 × 48 ÷ 16 + 8 – 40 = 40 (36 × 3 + 8 – 40) = 40 (108 + 8 – 40) = 40 (116 – 40) = 40 76 = 76
40    42    87    266    ?     5366
22, 23, 31, 57, 122, 247
32, 65 , 196, 785, ? , 23557
19.11 × 5.98 + 20.03 × 3.12 – 34.95 + 97.9 × 3.02 =?
7200 7200 3600 1200 300 ?
...0.5 1.5 5 ? 76 385
...24, 33, 50, ?, 108, 149
25, 200, 40, ?, 64, 512
1400      350       700       175        ?       87.5
...7 12 33 ? 635 3804
...
