EASY
10th CBSE
IMPORTANT
Earn 100

A chemist has one solution which is 40% acid and another which is 20% acid. How much of each solution should the chemist mix to get 10L (litre) of a solution which is 25% acid?

Important Questions on Pair Of Linear Equations In Two Variables

EASY
10th CBSE
IMPORTANT
New Mathematics for Class X>Chapter 3 - Pair Of Linear Equations In Two Variables>EXERCISE>Q 32
One hundred and fifty students are admitted to a school. They are distributed over three sections A, B and C. If 6 students are shifted from section A to section C, the two sections will have equal number of students. If 4 times of students of C exceeds the number of students of section A by the number of students in section B, find the number of students in three sections.
EASY
10th CBSE
IMPORTANT
New Mathematics for Class X>Chapter 3 - Pair Of Linear Equations In Two Variables>EXERCISE>Q 33
The distance between two places A and B is 300 metres. Rohan starts running from A towards B while Deepak starts running from B towards A. They meet after 4 minutes. Had Rohan doubled his speed and Deepak reduced his by 50%, they would have met one minute earlier. Find their respective speeds. 
EASY
10th CBSE
IMPORTANT
New Mathematics for Class X>Chapter 3 - Pair Of Linear Equations In Two Variables>EXERCISE>Q 34
Mr John has a son and a daughter, the son being 4 years older than the daughter. Five years ago, the age of Mr John was 23 years more than the sum of ages of his son and daughter. After 18 years from now, the age of Mr John will be seventeen times the difference of ages of his son and daughter. Find the present ages.
EASY
10th CBSE
IMPORTANT
New Mathematics for Class X>Chapter 3 - Pair Of Linear Equations In Two Variables>EXERCISE>Q 35
A dishonest milkman has one bucket of milk of 80% purity. He has another bucket milk of 60% purity. How much milk of each kind should be mixed to supply 20 litres of milk of 75% purity?
EASY
10th CBSE
IMPORTANT
New Mathematics for Class X>Chapter 3 - Pair Of Linear Equations In Two Variables>EXERCISE>Q 36
A milkman has a smaller drum half full of milk and a larger one of twice, the capacity of the smaller one with 1/4 full of milk. He adds water to the two drums so that both of them are full. The milk in both the drums are emptied into a tub. What is the fraction of the milk in the contents of the type?
EASY
10th CBSE
IMPORTANT
New Mathematics for Class X>Chapter 3 - Pair Of Linear Equations In Two Variables>EXERCISE>Q 37
If two liquids are mixed in the ratio 4:3, a mixture is obtained weighing 1.04 g per c.c.; while they are mixed in the ratio 6:4, the resulting mixture weighs 1.05 g per c.c.; Find the weight of a c.c. of each of original liquids.
MEDIUM
10th CBSE
IMPORTANT
New Mathematics for Class X>Chapter 3 - Pair Of Linear Equations In Two Variables>EXERCISE>Q 38
A cyclist after riding a certain distance stopped for half an hour to repair his machine after which he completes the whole journey of 30 km at half speed in 5 hours. If breakdown had occurred 10 kms farther off, he would have done the whole journey in 4 hrs. Find where the breakdown occurred and his original speed.
EASY
10th CBSE
IMPORTANT
New Mathematics for Class X>Chapter 3 - Pair Of Linear Equations In Two Variables>EXERCISE>Q 39
A train overtakes two persons who are walking in the same direction in which the train is going, at the speed of 2 kmph and 4 kmph passes them completely in 9 and 10 seconds respectively. Find the length and speed of the train.