Reason - practice problems
In mathematics, reasoning is key to:1. Problem solving – Helps analyze a task, choose the right procedure, and verify the result (e.g., "Does this answer make sense?").
2. Proving statements – Logical reasoning is needed when deriving formulas or geometric theorems (e.g., proving the Pythagorean theorem).
3. General generalization – Allows you to connect specific examples with general rules (e.g., "Why does the distributive law work?").
4. Critical thinking – Helps you detect errors in reasoning or calculations (e.g., "Is this step logical?").
5. Application of mathematics in practice – Allows you to select an appropriate mathematical model for real-world situations (e.g., calculating interest at a bank).
Without reasoning, mathematics would be just a mechanical repetition of procedures.
Number of problems found: 2168
- A pie 16
A pie is divided among 100 guests. Guest 1 gets 1%, guest 2 gets 2% of what is left, and so on. Who gets the largest piece of pie? - Division with a remainder
Find the smallest number which, when divided by 8, 12, and 20, leaves a remainder of 5 in each case. - Apples 32
A woman sold half of her apples to the 1st customer, half of the remainder to the 2nd customer, half of what remained to the 3rd customer, and again half of the remainder to the 4th customer. She was then left with 15 apples. What was the total number of - Two trains 16
Two trains cross each other in 14 seconds when moving in opposite directions, and in 3 minutes and 2 seconds when moving in the same direction. By what percentage is the speed of the faster train greater than that of the slower train? - A variable
A variable rectangle has a constant area of 35 cm². Find the side lengths when the perimeter is at its minimum. - Three people
Three people: Peter, Quinton, and Roland. 5 years ago, the average age of P and Q was 15 years. The current average age of P, Q, and R is 20 years. Find the age of R in 10 years. - Monthly income
There are three workers: X, Y, and Z. The average monthly income of X and Y is $5,050. The average monthly income of Y and Z is $6,250, and the average monthly income of X and Z is $5,200. What is the monthly income of X? - Common work
39 men can repair a road in 12 days working 5 hours a day. How many days will be required to complete the same work with 30 men working 6 hours a day? - Big school 2
The ratio of boys to girls in a school of 450 pupils is 4:5. When some new boys and girls are admitted, the number of boys increases by 25 and the ratio of boys to girls changes to 9:13. Calculate the number of new girls admitted. - Palidrom
A number consists of two digits whose product is 24. When 18 is subtracted from the number, the digits change their places. Find the number. - Clock error
How much does a watch lose per day, if its hands coincide every 64 minutes? - Minimum interior angle
What is the minimum interior angle possible for a regular polygon? - 4th digit
Write a digit in place of X so that 85X634 is divisible by 11. - A train 4
A train passes two bridges of 400 m and 260 m in 25 sec and 18 sec, respectively. Find the length and speed of the train. - Milk bottles
A container of milk was 4/5 full. When 12 bottles of milk were taken out and 8 bottles of milk poured into it, it was 3/4 full.How many bottles of milk can the container contain? - Full-tank
A full-tank of petrol a car lasts for 10 days. If driver starts using 25% more everyday, how many days will the full-tank petrol last? - A mobile
A mobile phone and a tablet were sold at a profit of 10% and a loss of 8% respectively . If the cost price of the mobile is 1.5 times that of the tablet what is the overall percentage earned by selling both the articles? - A contractor 2
A contractor has to complete his contract in 92 days. 234 men were set to do the work, each of them works for 16 hours/day. After 66 days, 4/7 of the work is completed. How many additional men may be employed, so that the work may be completed in time, ea - Multiple and remainder
What is the least multiple of 7, which, when divided by each one of 6,9,15,18, gives the remainder of 4 in each case? - Sport field
There is a circular path around a sports field. Sonia takes 18 minutes to drive one round of the field, while Roland takes 12 minutes for the same. Suppose they both start at the same point and at the same time and go in the same direction. After how many
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