8 bags of gravel and 7 bars of sand costs €60.20 in total 6 bags of gravel and A bags of sand costs 40.40 in total
How much would it cost in total to buy 2 bags of gravel and 1 bag of sand?​

the answer to your question a or b but i am pretty sure it is b. i hope this : )

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so then what are you asking?

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odd numbers are only divisible by 1 and itself.

even numbers are divisible by more than 1 and itself.

for example 6 is even because it is divisible by more than 1 and its self. 1 x 6= 6 ; 2 x 3= 6

and 7 is odd because only 7 x 1 equals seveb