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).
Answers
Answered by
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Step-by-step explanation:
1) twice number be 2x
2x-7=45
2x=45+7
2x=52
x=52/2
x=26
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