Question

16. The ratio of income to expenditure of a family is 7: 6. Find the savings if the income is
14000.
17. The ratio of zinc and copper in an alloy is 7: 9. If the weight of copper in the alloy is 11.7 ko
find the weight of zinc in it.
18. A bus covers 128 km in 2 hours and a train covers 240 km in 3 hours. Find the ratio of
their speeds.



Solut​

Answer 1

Answer:

Ratio of income to ependiture = 7:6

So ratio of income to saving = 7:1

total income is 14000 . so 14000/7 = 2000

total expenditure is 2000*6 = 12000

Total saving is 2000*1 = 2000

Answer : saving is rs 2000.

17.

zinc : copper = 7 : 9 : : x : 11.7

= 7/9 x/11.7

cross multiplication

= 7*11.7=9*x

= 81.9 = 9x

= 81.9/9 = x

= 9.1 = x

Answer 2

Answer:

When the "income is Rs 14000", the savings is .

Given:

Ratio of "income to expenditure" = 7:6

To find:

Savings of the family.

Solution:

Savings is amount from income eliminating expenditure money.

The formula for savings is given below:

Savings(S)= Income-ExpenditureSavings(S)=Income−Expenditure

Let consider the income be 7x and the expenditure be 6x

Then,

S = 7x - 6xS=7x−6x

S = xS=x

Thus, the savings(S) is x.

Income = 7xIncome=7x

Apply the amount of income given in the question,

14000 = 7x14000=7x

x = \frac{14000}{7}x=

7

14000

x = 2000x=2000