Question

Mary has 21 coins whose total value is ksh 72.there are twice as many five shilings coins as there are ten shilings coins.the rest are one shilings coin.find the number of ten shilings coin that mary has

Answer 1

Explanation:

Value from:

1 shilling coins

=

1

(

21

−

3

x

)

=

21

−

3

x

5 shilling coins

=

5

(

2

x

)

=

10

x

10 shilling coins

=

10

(

x

)

=

10

x

Total value

=

72

shillings

i.e.

21

−

3

x

+

10

x

+

10

x

=

72

shillings

−

3

x

+

10

x

+

10

x

=

72

−

21

17

x

=

51

x

=

51

17

x

=

3

∴

Mary has

3 10

shilling coins.