7. a gardener buys fifty carrot seeds and twenty lettuce seeds for $1.10
and her mother buys thirty carrot seeds and forty lettuce seeds for
$1.50. find the cost of one carrot seed and one lettuce seed.

one carrot = $ 0.01

one lettuce = 0.03

Step-by-step explanation:Let c represent carrot and l represent lettuce then, from the question

50c + 20 l = 1.10

30c + 40l = 1.50

Solving simultaneously

multiply equation 1 by 2 and equation 2 by 1

⇒ 100 c + 40l = 2.20

   30 c + 40 l = 1.50

subtract equation 4 from equation 3

⇒ 70 c = 0.7

         c = 0.01

substituting c = 0.01 into equation 1 gives l = 0.03

b.my answer is b.

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