15% of a number is 40, and 1 / 4 of it is 60 ()

Obviously wrong

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1. Find the rules 6,13,27,49, (), 121, (). How to fill in the brackets?
2. 13,27,49,( ),121,( ).
3. What is the law between 6.13.27.49. (). 121. ()
4. Find the rule: 5 11 23 47 () 191 () 5 13 37 109 () () 6 13 27 49 () 121 () There's another group There were four groups as follows 5 11 23 47 （）191 （） 5 13 37 109 （）（） 6 13 27 49 （）121 （） 6 15 38 65 106 （）（）
5. 0,4,16,40,80,（） A．160 B．128 C．136 D．140
6. 1; 2,12,36,80,()2; 1,3,4,1,9,()3; 0,4,16,40,80,()
7. Find the rule, fill in 1 / 2, 0.2, 2.5, 0.4, 4 1 / 2, 3 / 5, (), 80% 1 / 2 (this is half), 0.2, 2.5, 0.4, 4 1 / 2 (this is four and half), 3 / 5 (three fifths), (), 80% Please explain why
8. What do you fill in: 20%, 0.4%, 80%, 15 / 3, 5 / 16, 640%, 12.8, ()?
9. 0,4,16,40,80,（）
10. Look for rules 4,16,40, () why
11. What is the law between the numbers 9, 1, 4, 3, 40121
12. Find the rule: 1, 4, 13, 40, 121? I want to write an algebraic expression
13. Find the rule: 1.5, 4.5, 13.5, (), 121.5 1,5,9,13,…… The tenth number is ()
14. Find the rules P1, 4, 13, 40, 121
15. Four out of nine, two out of nine, one out of nine, (), one out of 36, () find the law
16. Find the rule: 4 out of 9, 2 out of 9, 1 out of 9, (), 1 out of 36, (), ()
17. Given that a, B, C, D, e and F are six mutually unequal integers and a × B × C × D × e × f = 36, then a + B + C + D + e + F = ()
18. If the product of six integers a * b * c * D * e * f = 36, a, B, C, D, e and F are not equal to each other, then a + B + C + D + e + F = () a, 0 B, 4 C, 6 D and 8 are solved
19. The voltage of sinusoidal current for lighting is 220 V, what are its effective value and peak value?
20. A batch of fruits are transported from the fruit shop. The weight of apples is 21 kg less than 3 times that of pears. The weight of apples is 49 kg more than 2 times that of pears. How many kg are the pears and apples transported?