Math practice for 13 year olds - page 5 of 428
Number of problems found: 8555
- An article 2
An article is bought for $124. What should the marked selling price be so that there is a profit of 10% even after allowing a discount of 12%? - Price of rice
The price of rice is reduced by 5%. How many kilograms of rice can now be bought for the money that was sufficient to buy 50 kg of rice before the reduction? - Bananas 5
A fruit vendor was able to sell 85% of his 80 kilograms of bananas. How many kilograms of bananas were sold? - A kite 3
A kite is flying at a height of 60 m above the ground. The string attached to the kite is temporarily tied to a point on the ground. The inclination of the string with the ground is 60°. Find the length of the string, assuming that there is no slack in th - Horses and hens
In a park, there are some horses and some hens. If the total number of heads is 68 and the total number of legs is 198, find the number of hens in the park. - Sharing money 2
Ann and Betty shared a sum of money in the ratio 2:3, and Ann received $120. What is Betty's share? - A man 23
A man has some money. He gives 50% of it to his wife and 40% of the remainder to his daughter. He gives the rest to his son. If the son receives €12,000, how much did his wife receive? - Expression - two variables
The formula with two variables is given: y = 5x + 38. Solve for x. - Repeating to infinity
How do I express 0.99999999… as a fraction? (nine repeating) Additional questions: Can you write 0.9999… repeating as a fraction? How do you convert 0.9 repeating into a fraction? - Angle and slope
Find the angle between the x-axis and the line joining the points (3, −1) and (4, −2). - A variable
A variable rectangle has a constant area of 35 cm². Find the side lengths when the perimeter is at its minimum. - A ration
108 kg of rations are sufficient for 18 students for 15 days. For how many students will 70 kg of rations be sufficient for 25 days? - Michael 9
Michael purchased an old scooter for ₹12,000 and spent ₹2,840 on its overhaul. He then sold it to his friend for ₹13,860. What was his percentage gain or loss? - Cash discount
The marked price of a mobile phone is ₹6,000. The shopkeeper offers a 5% discount for cash payment. If the VAT rate is 8%, find the amount the customer has to pay in cash. - A chord 2
A chord of length 16 cm is drawn in a circle of radius 10 cm. Calculate the distance of the chord from the centre of the circle. - Isosceles triangle 17
One of the equal sides of an isosceles triangle is 13 cm and its perimeter is 50 cm. Find the area of the triangle. - Two trains 15
A train travelling at 50 km/h leaves Delhi at 8 AM and another train travelling at 70 km/h leaves Delhi at 11 AM in the same direction. How many km from Delhi will they be when the faster train catches the slower one? - Five men
5 men or 9 women can complete a piece of work in 19 days. In how many days will 3 men and 6 women complete it? - A business Two people, A and B, start a business. A invested $21,000 from the beginning. B joined later with $36,000. After how many months did B join if the profits at the end of the year are divided equally?
- Children ratio
In a certain office, 1/3 of the workers are women. Of the women, 1/2 are married, and of the married women, 1/3 have children. Of the men, 3/4 are married, and of the married men, 2/3 have children. What fraction of the workers have no children?
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