Five numbers in ratio

Five integers are in the ratio 1: 2: 3: 4: 5. Their arithmetic mean is 12. Determine the smallest of these numbers.

Correct answer:

a =  4

Step-by-step explanation:

a:2a:3a:4a:5a=1:2:3:4:5  (a+2a+3a+4a+5a)/5=12  (a+2⋅ a+3⋅ a+4⋅ a+5⋅ a)/5=12  15a=60  a=4

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