Math practice for 13 year olds - page 102 of 413

Number of problems found: 8253

Six numbers
The average of 6 numbers is 3.95. the average of two of them is 3.4, while the average of the other two is 3.85. What is the average of the remaining two numbers?
Freddy
Freddy has £24, and Layla has £32. Freddy spends 11/12 of his money, and Layla spends 7/8 of her money. How much more money does Layla spend than Freddy?
One gas
One gas tank was 2/3 full. The second tank of equal size was 1/5 full. The amount of gas in the 1st tank was 100 liters. How many liters is the amount of gas in the second tank?
Fuel volume
1/2 of a tank is filled with oil when 36 liters are removed, and the remaining oil fills 1/10 of the tank. What fraction of the total is the amount of oil removed?
Weighted-average
Calculate the weighted average cost of the following inventory purchases: Date Quantity; Purchased ; Cost per Unit May 4; 33; $12.25 May 11; 41; $13.87 May 29; 37; $11.99
A car 3
A car rental agency advertised renting a car for 27.95 per day and 0.28 per mile. If Greg rents this car for two days, how many whole miles can he drive on a $100 budget?
School
There are 500 students in the school. 60% of them are boys, and the rest are girls. What is the percentage of girls? Also, find the total number of boys and girls in the school.
A twelve-pack
A twelve-pack of juice costs $4.20. An eighteen-pack of juice costs $5.40. The eighteen-pack of juice is a better buy. How much cheaper PER JUICE is the eighteen-pack?
Joshua
Joshua bought 7 1/2 kilograms of chicken. He used 2 3/4 kilograms for caldereta, 3 1/8 kilograms for tinola, and the rest for frying. How many kilograms of chicken did he use for frying?
Water level 7
Between 9 PM and 6:45 AM, the water level in a swimming pool decreased by 4/9 inch. Assuming that the water level decreased constantly, how much did the water level drop each hour?
Sari-sari store
Ms Rona bought 25 kg of sugar for her store. She repacked the sugar into ¼ kg and ½ kg bags. If she packed 30 bags of ½ kg each, how many ¼ kg bags did she pack?
A total
A total of 200 cash consists of 1-peso, 5-peso, and 10-peso coins, their values being in the ratio of 80:C:50. Find the ratio (in terms of quantity of coins) of 5-peso coins to 1-peso coins.
A father
A father wants to leave 30,000 to his four children in the ratio of 1:2:3:4. How much will each child receive?
Trapezoid and bases
Find the area of the trapezoid whose bases differ by three and whose height is three less than twice the upper base.
Evaluate 26
Evaluate square root: √1³+2³+3³+4³=
A triangle 4
A triangle has a perimeter of 18a + 6b + 15 and has sides of lengths 5a + 7 and 8a +4b. What is the length of the third side? Write an expression and simplify it to find the solution to the problem.
Ms. Althea
Ms. Althea reaped 180 tomatoes from her field. She gave 1/5 of them to a friend, sold 0.75 of the remainder, and kept the rest for herself. What percentage of the total did Ms. Does Althea keep it for herself?
Ivan rented
Ivan rented a truck for one day. The base fee was $14.95, and he drove an additional charge of 73 cents for each mile. When he returned the truck, he had to pay $114.96. How many miles did he drive the truck?
A sum 3
A sum of money is shared among Jamby, Fritz, and Alvin in the ratio of 5:2:3. If Jamby received Php 35, find the amount of money received by Alvin and the total sum of money shared.
Raj walk
Raj walks 9/7 km from place A towards the east and then 2 1/4 km from there towards the west. Where will he be now from A?

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