EXERCISE 4.4
1/1. Set up equations and solve them to find the unknown numbers in the following cases:
(a) Add 4 to eight times a number; you get 60.
(b) One-fifth of a number minus 4 gives 3.
(c) If I take three-fourths of a number and add 3 to it, I get 21.
(d) When I subtracted 11 from twice a number, the result was 15.
(e) Munna subtracts thrice the number of notebooks he has from 50, he finds the
result to be 8.
(1) Ibenhal thinks of a number. If she adds 19 to it and divides the sum by 5, she
will get 8.
5
(g) Anwar thinks of a number. If he takes away 7 from of the number, the
result is 23.
Answers
Answer for i) Let the number of marbles Parmit have be m.
Thus, IrfN have 5m+7 marbles.
Equation- 5m+7=37
Solution- 5m+7=37
5m=37-7 ( 7 is transposed to RHS )
= 30
m= 30/5 ( 5 is transposed to RHS)
=6
Thus, Parmit has 6 marbles.
ii) Let Laxmi's age be l.
Thus, her father's age is 3l+4 years.
Equation
3l+4= 49
solution
3l+4 =49
3l=49-4
=45
l = 45/3
= 15 years
iii) Let the number of fruit trees planted be f.
Thus, non fruit trees are 3f+2= 77
equation
3f+2=77
solution
3f=77-2
= 75
f= 75/3
= 25
Thus, the no. of fruit trees planted is 25.
4) Riddle:
answer
Let the no. be x
equation
7x+50+40=300
solution
7x+50=300-40=260
7x = 260-50=210
x=210/7=30
Thus, the number is 30.
Step-by-step explanation:
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