Linear Equations in One variable RS Aggarwal Class 7 Chapter 7 Exercise 7B Solution, In this section of Maths the student gets detailed solutions of all question.
RS Aggarwal Class 7 Ex. 7B Solution
RS Aggarwal Class 7 Exercise 7A Solution
1: Twice a number when decreased by 7 gives 45. Find the number.
4: A number when added to its half gives 72. Find the number.
6: A number when multiplied by 4, exceeds itself by 45. Find the number.
9: A number is 2/5 times another number. If their sum is 70, find the numbers.
11: The fifth part of a number when increased by 5 equals its fourth part decreased by 5. Find the number.
13: Find two consecutive odd integers whose sum is 76.
15: Divide 184 into two parts such that one-third of one part may exceed one-seventh of the other part by 8.
16: A sum of Rs. 500 is in the form of denominators of Rs. 5 and Rs. 10. If the total number of notes is 90, find the number of notes of each type.
17: Sumitra has Rs. 34 in 50-paise and 25-paise coins. If the number of 25-paise coins is twice the number of 50-paise coins, how many coins of each kind does she have?
18: Raju is 19 years younger than his cousin. After 5 years, their ages will be in the ratio 2 : 3. Find their present ages.
19: A father is 30 years older than his son. In 12 years, the man will be the three times as old as his son. Find their present ages.
20: The ages of Sonal and Manoj are in the ratio 7 : 5. Ten years hence, the ratio of their ages will be 9 : 7. Find their present ages.
21: Five year ago a man was seven times as old as his son. Five years hence, the farther will be three times as old as his son. Find their present ages.
22: After 12 years Manoj will be 3 times as old as he was 4 years ago. Find his present age.
23: In an examination, a student requires 40% of the total marks to pass. If Rupa gets 185 marks and fails by 15 marks, find the total marks.
24: A number consists of two digits whose sum is 8. If 18 is added to the number its digits are reversed. Find the number.
25: The total cost of 3 tables and 2 chairs is Rs. 1850. If a table costs Rs. 75 more than a chair, find the price of each.
26: A man sold an article for Rs. 495 and gained 10% on it. Find the cost price of the article.
27: The length of the rectangular field is twice its breadth. If the perimeter of the field is 150 meters, find its length and breadth.
28: Two equal sides of a triangle are each 5 meters less than twice the third side. If the perimeter of the triangle is 55 meters, find the length of its sides.
29: Two complementary angles differ by 80. Find the angles.
30: Two supplementary angles differ by 440. Find the angles.
31: In an isosceles triangle the base angles are equal and the vertex angle is twice of each base angle. Find the measures of the angles of the triangle.
32: A man travelled 3/5 of his journey by rail, ¼ by a taxi, 1/8 by a bus and the remaining 2 km on foot. What is the length of his total journey?
33: A labourer is engaged for 20 days on the condition that he will receive Rs. 120 for each day he works and will be fined Rs. 10 for each day he is absent. If he receives Rs. 1880 in all, for how many days did he remain absent?
34: Hari Babu left one – third of his property to his son, one-fourth to his daughter and the remainder to his wife. If his wife’s share is Rs. 18000, what was the worth of his total property?
35: How much pure alcohol must be added to 400 mL of a 15% solution to make its strength 32%?
