Kangaroo

Kangaroo does 10 jumps in 1 minute and then three minutes lie, then will make 10 jumps in 1 minute and 3 minutes lie, and so on. Find the shortest time in which a kangaroo does 30 jumps.

Correct answer:

t =  9 min

Step-by-step explanation:

$t=30\mathrm{/}10\cdot 1+2\cdot 3=9\text{ min}$

Try another example

Related math problems and questions:

• Two numbers
  Find the four times smaller number for numbers 12 and 36 and then add them.
• Children in the classroom
  How many children are in the classroom, where Ladislav is 10th lightest and 16th heaviest in class?
• Look at
  Look at the time on the clock now. Information The short hour hand is between 9 and 10. The long minute hand points to 5. Question Second-graders go to recess in 15 minutes. What time will it be then?
• Grandma
  Grandma bought two 10 pack of eggs. She used 8 eggs on the cake, 2 times less on the omelette and 4 more eggs for breakfast. How many eggs did it stand for?
• Three cats
  If three cats eat three mice in three minutes, after which time 90 cats eat 90 mice?
• Orchard
  10 trees in 5 lines grows in the orchard. How many trees are in the orchard?
• Ton's teeth
  Calculate at what age homeless Anton will toothless. At age 29 has 26 teeth and each year next one tooth broke.
• Fisherman
  Fisherman caught 32 fish, which is four times more than last year. How many fish he caught last year?
• Adding mixed 3
  Why does 1 3/4 + 2 9/10 equal 4.65? How do you solve this?
• Emily
  Emily had 20 minutes to do a three-problem quiz. She spent 11 3/4 minutes on question A and 5 1/2 minutes on question B. How much time did she have left for question C?
• Three digits number 2
  Find the number of all three-digit positive integers that can be put together from digits 1,2,3,4 and which are subject to the same time has the following conditions: on one positions is one of the numbers 1,3,4, on the place of hundreds 4 or 2.
• Consider 2
  Consider the following formula: y = 3 ( x + 5 ) ( x - 2 ) Which of the following formulas is equivalent to this one? A. Y=3x²+9x-30 B. Y=x²+3x-10 C. Y=3x²+3x-10 D. Y=3x²+3x-30
• Numbers
  By how many is the difference of numbers 8 and 34 less than its product?
• Bus
  At the bus stop boarded 6 people into the bus and on each other bus stop one man more than the previous one. On E station never boarded. Stops are A, B, C, D, E. Calculate the number of people on the bus after leaving the station E.
• Evaluate mixed expressions
  Which of the following is equal to 4 and 2 over 3 divided by 3 and 1 over 2? A. 4 and 2 over 3 times 3 and 2 over 1 B. 14 over 3 times 2 over 7 C. 14 over 3 times 7 over 2 D. 42 over 3 times 2 over 31
• Tadeus
  Tadeus and Jolana have a total of CZK 15. Jolana has half that of Tadeus. Nevertheless, Jolana has 3 coins and Tadeus 2. Which coin does Tadeus have and which Jolan?
• Millie
  Millie has 3 sisters. Each sister reads 2 pages every morning and 4 pages every evening. Which expression can be used to represent the total number of pages read by Millie's sisters after 5 days?