Math practice for 13 year olds - page 111 of 422

Number of problems found: 8424

Simultaneously 68864
From cities A and B, which are 50 km apart, two cars set off in the same direction simultaneously with average speeds of 80 km/h and 120 km/h. How long will the faster car reach, the slower one, and at what distance from city A?
Hectares 68854
Tractor drivers plow "h" hectares of land per day. How many hectares of land would they have to plow per day to plow the 585 ha area three days earlier than planned? For which "h" does this problem have a positive solution?
Determine 68804
The basket contains five red apples with an average weight of 125 grams and one yellow apple. The average weight of all apples in a basket is 120 grams. Determine the weight of the yellow apple in grams.
Intersections 68784
The figure shows the circles k₁(S₁; r1=9 cm) and k₂(S2; r2 = 5 cm). Their intersections determine a common chord t 8 cm long. Calculate the center distance |S₁ S₂| in cm to two decimal places.
Temperature - change
The thermometer showed -2 °C in the morning. By lunch, the temperature had risen by 5°C. The temperature had dropped by 13°C till midnight. What temperature in °C did the thermometer show at midnight?
Mark Argie
Mark Argie has P11.50 more than Erwin. Together, the two boys have P131.50. How much does Mark Argie have?
Fertilizer 68694
0.6 l of fertilizer goes to 40 l of water. How much fertilizer should be put in per 10 liters of water?
Which 9
Which of the temperatures is the coldest? A.100 degrees Celsius, B.373 degree Kelvin, C. 32 degrees Fahrenheit.
Grandma 9
Grandma bought 2 kilograms of apples at a crowns per kilogram, 5 kg of potatoes at b crowns per kilogram, and one celery for 12 crowns. She paid with three fifty crowns. o Depending on the quantities a, b, express the amount in crowns that was returned to
Corresponding 68604
The prism with a square base has a volume of 200 liters, and the length of its base edge is a decimeter. Using the corresponding expression of the prism, write the height of the prism in decimetres.
Probability 68574
The target is divided into three zones. The probability of a shooter hitting the first band is 0.18, the second band 0.2, and the third band 0.44. What is the probability that a) hits the target, b) miss the target?
Probability 68564
What is the probability that the number a) greater than 4, b) Will the number greater than four fall on the dice roll?
Expression 68504
Determine the number by which we must multiply the expression (square root one plus one whole and one quarter) to obtain the number 12.
Assignment 68494
Write the assignment in a fraction. Fill in the number in the box so that the equality applies: (Write the result as a fraction in the base form.) (1 1/3 - 3/4) · ___ = 1/2
Calculate 68454
Calculate how many times the square of the number 1/100 is less than 1/1000. (numbers in fraction form)
One-seventh 68434
It is given that 1 1/7 of the whole is 32. Determine what 2 1/4 of the total is. (One whole and one-seventh, two whole and one quarter).
Calculate 68394
The sizes of the interior angles of the triangle are in the ratio of 3:4:5. Calculate these angles.
Terezka 2
Terezka has two younger siblings, 40-month-old Anička and 7-month-old Kája. o Calculate how many months it will take for Anička to be four times older than Kája. o Calculate the age difference between Tereza and Anička if Tereza celebrated her sixth birth
A fan
A fan with a resistance of 20 Ω is connected to a power supply. The current flowing through the circuit is 2.5 A. What is the voltage of the power supply?
Angle of the sector
Find the angle of the sector of a circle radius of 20 units where the area is equal to the lateral area of a cone with a radius of 8 units.

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