Question
In a class, 3/7 of the students are girls and rest are
boys. If 1/3 of the girls and 1/5 of the boys are absent. What part of the total number of students are present?Solution
Let the total number of students in a class be x ∴ According to the question, Number of girls = 3/7 x and number of boys = x - 3/7 x = 4/7 x Number of girls who are absent = 1/3 × 3/7 x = x/7 and number of boys who are absent = 1/5 × 4/7 x = 4x/35 ∴ Total number of students who are present = x - x/7 - 4x/35 = (35x - 5x - 4x)/35 = 26x/35 ∴ The 26/35 part of the students are present in the class.
‘A’ and ‘B’ started moving towards each other at same time with a speed of 12 km/hr and 6 km/hr, respectively. If the distance covered by ‘A�...
A Boy plants a bomb at a place in Diwali and starts running at 30 m/s. After 54 seconds the bomb was blast. In how much time the sound of blast will be ...
Find the distance travelled (in km) by the truck to reach point B from point A, if a car cover 25% the same distance in 2 hours and a truck covers 30%...
A man running with the speed of 58 km/hr covers a certain distance in ‘x’ hours. If the same distance can be travelled with a speed of 62 km/h in (x...
- A vehicle travels at 36 km/h and is scheduled to reach its destination in 100 minutes. After traveling half the distance, it stops for 10 minutes. What sho...
A cyclist moves at a speed of 'w' km/hr. After 5 hours, they increase their speed to (w + 8) and cycle for another 3 hours. If the ratio of the distance...
Axar covered 1/4th of the total distance at a speed of 25 km/hr. Then, he covered (1/2) of the remaining distance at a speed of 30 km/hr, and the rest o...
A train crosses a pole in 12 sec, and a bridge of length 170 m in 36 sec. Then the speed of the train is:
‘E’ and ‘F’ started moving towards each other at the same time with a speed of 30 km/hr and 25 km/hr, respectively. If the distance covered by �...
In a 500-metre race, ‘A’ beats ‘B’ by 15 seconds or 75 metres. Find the time taken by ‘B’ to finish the race.
Relevant for Exams:
