Sum and rounding

I know two numbers whose sum is 20. When they each round and then added together I get the 30. What are this numbers?

Result

a =  15
b =  5

Solution:

Solution in text a =
Solution in text b =







Leave us a comment of this math problem and its solution (i.e. if it is still somewhat unclear...):

Showing 0 comments:
1st comment
Be the first to comment!
avatar




To solve this verbal math problem are needed these knowledge from mathematics:

Next similar math problems:

  1. To thousands
    thousand_money Round to thousands following numbers:
  2. Valid number
    numbers Round the 453874528 on 2 significant numbers.
  3. Mystery number
    numbers2_38 A mystery number is between 800 and 920. No digits are the same. The difference of the number is 5. What is the mystery number?
  4. Unknown number 22
    numbers2_22 I am a two-digit number. My tens digits is 4. My ones digit is 3 more than my tens. Who am I?
  5. Unknown number 2
    num_sphere I think the number. When he reduces it four times, I'll get 11. What number am I thinking?
  6. Cakes
    cookies On the table was 56 cakes. When Peter went home, leaving them eight times less. How many cakes left?
  7. Subtraction
    cards1 How many times you can subtract the number 4 from the number 64?
  8. Bus 2
    bus2 On the 6-th stop 44 passengers take off from bus. Overall, the 6-th stop 13 passengers were added. How many passengers take on 6-th stop?
  9. Parking field
    motorbike There were nine cars in the parking field. The motorcycles were three times less. How many motorcycles are here and how many wheels in the parking field?
  10. Mom and dad
    love Mom wants talk with dad 2.2 hours. But dad wants of 2 times more hours than mom ... How many hours wants dad talk with mom? ...
  11. Snacks
    skola_9 The school attends 344 pupils. Half of them take snacks. 13 pupils who took snacks did not attend school. How many snacks left?
  12. Goat, cabbage and wolf
    goat__wolf_and_cabbage A man once had to travel with a wolf, a goat and a cabbage. He had to take good care of them, since the wolf would like to taste a.piece of goat if he would get the chance, while the goat appeared to long for a tasty cabbage. After some traveling, he sudde
  13. 3 goods
    3veci Ms. Beránková bought in the shop 3 goods. Total paid for the purchase was 248 CZK. The first thing was 112 CZK and second 101 CZK. How much was the third thing?
  14. Carpenter
    stolar You want to cut long board into smaller pieces. Carpenter said that one cut of the board into two pieces will cost you 70 cents. But you need to cut the board into 9 parts. How much you pay?
  15. Curtains
    zaclony For room equipment bought Hanak 50 m curtains. On the dining room needed 90 m and 90 m to hallways of curtains. How many meters of curtains bought totally?
  16. Fishing boat
    rybnik_4 The fishing boat caught 14 fish in one day. How many fish will catch 4 fishing boats in 8 days?
  17. Book
    books_6 Jitka read on holidays book that has 180 pages. In the first week read 45 pages. In the second week she read 15 pages more than the first week. How many pages left to read it yet?