Question

quantity of lead to be added = 30 kg.
EXERCISE 78
1. Twice a number when decreased by 7 gives 45. Find the number.
2. Thrice a number when increased by 5 gives 44. Find the number.
26
3. Four added to twice a number yields Find the fraction.
5
4. A number when added to its half gives 72. Find the number.
5. A number added to its two-thirds is equal to 55. Find the number.
6. A number when multiplied by 4, exceeds itself by 45. Find the number.
7. A number is as much greater than 21 as it is less than 71. Find the number
Hint. (x-21)=(71-x).​

Answer 1

Step-by-step explanation:

1) twice number be 2x

2x-7=45

2x=45+7

2x=52

x=52/2

x=26