To feed 7 horses for 4 days, Mark needs 420 kg of grass. How many kilograms of grass does Mark need to feed 9 horses for 6 days?
1 answer:
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ANSWER
65
EXPLANATION
This will form a sequence with first term:
with constant difference d=6 and last term
The last term is a term in the sequence, therefore;
Simplify the LHS
Divide both sides by 6.
Therefore
Hence there are 65 multiples of 6.