Examples of equations for practice for 13 year olds - page 31 of 96
Number of problems found: 1913
- The factory
The factory z can complete an order in 12 days, factory p in 18 days. How many days does an order completed when the first two days work only the factory z and then both factories? - The train
The train passed the observer in the 20s and passed through a 1500m tunnel in 2 minutes. Calculate the speed (km/h) and train length. - Boys and girls 2
The ratio of boys to girls in the math club is 4:3 . After eight more girls join the club, the ratio becomes 1:1. How many members are there in the club now? - Cleaning windows
The cleaning company has to wash all the windows of the school. On the first day, washes one-sixth of the windows of the school. The next day three more windows than the first day, and the remaining 18 windows wash on the third day. Calculate how many win - Grass
Peter and Stano lawn grass for 3 hours 12 minutes. How long would it take for Peter if Stano lawn grasses himself for 384 minutes? - Boxes
Two hundred boxes have been straightened in three rows. The first row was 13 more than in the second, and the second was one-fifth more than in the third. How many boxes are in each row? - Salary increase
Ms. Merry's salary increased by 15%, which was 83 euros. What should you pay before the increase? - After 16 years
After 16 years, Dana will be five times older than she was four years ago. After how many years will Dana celebrate her 16th birthday? - Saving
Paul saves 155Kč in 46 2 Kc and 5Kc coins. How much saved 2Kc and 5Kc coins? - Tributaries
The first tributary fills the pool with water in 15 hours. The second tributary fills the pool in 10 hours. For how many hours is the pool filled with both tributaries? - Arc-sector
arc length = 17 cm area of sector = 55 cm² arc angle = ? the radius of the sector = ? - Cat
Half of the rest postpone a new smartphone for one-fifth of the monthly pocket money contributed to Maros for food for his cat. The remaining € 8 spend. How much pocket money gets Maros a month? - Welders
The welder does the job for six hours, the second one for 8 hours. How long do the job third welder, if all together can do the job in 2 hours? - Pumps A and B
Pump A fills the tank for 12 minutes, and pump B for 24 minutes. How long will it take to fill the tank if he is only three minutes work A and then both pumps A and B? - Performance
The same number of tickets sold for 15 CZK, 20 CZK, 30 CZK, and 40 CZK, a total of CZK 13,230 for theatre performances. How many tickets were sold for this performance? - The book
If you read p pages daily, you will read the book for 24 days. If you read ten pages each day more, you would read a book in 16 days. How many pages have the book? - Invitations
For every 5 minutes, writes Dana had ten invitations, while Anna had 14 invitations. How long will write together 120 invitations? - Container
On the first day got off 1/4 of the water from the full container, second day, 1/5 of the remaining water. How many percent remain container filled? - RT and ratio
A right triangle whose legs are in a ratio 6:12 has a hypotenuse 68 m long. How long are its legs? - Coin
How many 20-cent coins must be put in a row that the next 20-cent coins after them (above) rolled on its axis?
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