The ratio of a, B and C is 5:3:4. The number of a is 20. How much less is the number of B than the number of a?

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• 1. The number of a is five times that of B. what is the ratio of a and B, what is the ratio of the sum of a and B, and what is the ratio of a and B?
• 2. It takes 6 minutes for a part to be processed, 5 minutes for B and 4 minutes for C. now, 2220 parts are processed by 3 people in the same time, and each person is assigned How many parts of the mission? In proportion
• 3. The grain quality ratio of warehouse A and warehouse B is 8:7, one fourth of which is transported from warehouse A. if warehouse B increases by 6 tons, then warehouse B will have 14 tons more than warehouse A. how many tons each of warehouse A and warehouse B had
• 4. If you dream of becoming a spaceman when you____ up ,get started now!A spaceman n_____ a strong body and keen mind .You still have a long way to g_____ .Do you know what Shenzhou VI spaceman are able to do?Shenzhou VI spaceman are able to l______ upside down .They do this not just during s______ ,but also when eating and going to the toilet.Before f____ into space,they had lots of p____ .Echn upside-down training l____ for many days.They also have to know every part of the spaceship and how it w_____ .If something g____ wrong,they must know how to repair it. 1. ABCD and apqr are parallelogram, P, Q, R are on AB, AC, ad respectively, AP = 2qc, s quadrilateral ABCD = 36, then s quadrilateral apqr= A20 B24 C16 D18 2. Given a: B = C: D, then the middle term of the ratio of a & sup2; + C & sup2; and B & sup2; + D & sup2; is A、ac+bd B、ad+bc C、ad+cb D、ad+cd
• 5. lg20+log100（25）=_______ The solution of equation 2log3 (x) = 1 / 4 is________ log5(2)+2/3lg8+lg5lg20+(lg2)²=_________
• 6. 1, 2, 3, 4, 5, 6, 8, 12, 24 and 9 numbers are filled in the blank, so that the product of the multiplication of 3 numbers on each line is equal O——O——O I \ i / I O——O——O I / I \ I O——O——O
• 7. There are two sequences: 1, 3, 5, 7, 9 11,13,15,17,19,…… 1993 and 1,4,7,10,13,16,19 1993, find the number of the same number
• 8. Observation sequence: 2 / 3, 3 / 7, 4 / 11, 1 / 3, x, 7 / 23, 8 / 27 The value of X is ---, if it is arranged according to this rule, the 16th number is ---------
• 9. The formula consisting of three 5S and one 1 is equal to 24 Each number can only be used once
• 10. Xiaoming and Xiaojun went to buy greeting cards. Xiaojun bought 2.5 times as many as Xiaoming. After Xiaoming bought another 15 cards, the two bought the same number of cards. How much did each buy Why use 2.5-1?
• 11. The average number of a, B and C is 40, the ratio of a to B is 3:2, C is equal to half of B, what are the numbers of a, B and C
• 12. There are many students reading books in the library. Boys account for 40%. Later, four boys came in. At this time, boys account for 7 / 16 of the total number. How many people were there in the library? Using X solution Formula: OK, if you want to score all OK, 5, 0.15.20 ~ 1OO
• 13. Is the product of two primes greater than 2 prime or even
• 14. The product of a prime number multiplied by an even number must be () A. Odd B. even C. prime
• 15. The product of two primes must be?
• 16. The product of two primes is 94, and the sum of the two primes is______ ．
• 17. The product of two prime numbers is 94, the sum of these two prime numbers is (), and their greatest common factor is ()
• 18. 511 is not a prime number. Which two numbers' product = 511?
• 19. If both numbers are prime, then their product has a factor
• 20. A number () and two factors () are called prime numbers