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Answer:
18
Step-by-step explanation:
12 and 15 are both dividable by 3 and 3 apart so if you subtract 21 by 3 than you get 18
We know that 
.
Solve using cross multiplication of the last two fractions. I will use 
to represent the width of the rectangle. 
Multiply. 
Divide both sides of the equation by 
. 
It takes 7 hours to mow 4 lawns
Therefore every hour, (4 ÷ 7) or 4/7 lawns are mowed. This gives the rate.
For 35 hours, 4/7 x 35 lawns are mowed.
=35 ÷ 7 = 5
= 4 × 5
= 20 lawns
Answer: FAT SONIC SAYS.... THE ANSWER IS 125
