Farida bought 20 stamps consisting of 20 sen stamps and 60 sen stamps. The total cost of the stamps is RM8.80. How many 20 sej s

Question

3 years ago

14

tamps did Farida buy?

1 answer:

krek1111 [17] · Answer 1 · 2022-09-02T19:12:10+03:00

Answer:

# of 20cent stamps = 8

Step-by-step explanation:

Let the number 20cent stamps be = x

Let the number 60 cents stamps be = y

Total number of stamps => 20 = x + y ----------- ( 1 )

Total cost of the stamps = 8.80

That is, 0.20x + 0.60y = 8.80 ------------- ( 2 )

( 2 ) => 20x + 60y = 880

=> x + 3y = 44

=> x = 44 - 3y

Substitute x in ( 1 ) => x + y = 20

44 - 3y + y = 20

- 2y = 20 - 44

- 2y = - 24

2y = 24

y = 12

Substitute y = 12 in ( 1 ) => x + y = 20

x + 12 = 20

x = 8