Notebooks 8651

I need to buy exercise books and covers. One notebook costs CZK 12, and one cover costs CZK 3. I have one fifty crown and one twenty crown. How many notebooks and covers can I buy for it? Come up with more options.

Correct answer:

a =  5
b =  3

Step-by-step explanation:

12a+3b  50+20 12a+3b  70 3(4a+b)70  3(4a+b)=70x; x0  a=5
a1=1, b1=17, x1=7
a2=1, b2=18, x2=4
a3=1, b3=19, x3=1
a4=2, b4=13, x4=7
a5=2, b5=14, x5=4
a6=2, b6=15, x6=1
a7=3, b7=9, x7=7
a8=3, b8=10, x8=4
a9=3, b9=11, x9=1
a10=4, b10=5, x10=7
a11=4, b11=6, x11=4
a12=4, b12=7, x12=1
a13=5, b13=1, x13=7
a14=5, b14=2, x14=4
a15=5, b15=3, x15=1

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