9.10 Practice - Revenue and Distance 1) A merchant bought some pieces of silk for $900. Had he bought 3 pieces more for the same money, he would have paid $15 less for each piece. Find the number of...

Could you kindly solve and explain question no.11?

Extracted text: 9.10 Practice - Revenue and Distance 1) A merchant bought some pieces of silk for $900. Had he bought 3 pieces more for the same money, he would have paid $15 less for each piece. Find the number of pieces purchased. 2) A number of but 5 men failed to pay and thus increased the share of the others by $1 each. Find the amount that each man paid. certain amount to make up a deficit of $100 en subscribed 3) A merchant bought a number of barrels of apples for $120. He kept two barrels and sold the remainder at a profit of $2 per barrel making a total profit of $34. How many barrels did he originally buy? 4) A dealer bought a number of sheep for $440. After 5 had died he sold the remainder at a profit of $2 each making a profit of $60 for the sheep. How many sheep did he originally purchase? 5) A man bought a number of articles at equal cost for $500. He sold all but two for $540 at a profit of $5 for each item. How many articles did he buy? 6) A clothier bought a lot of suits for $750. He sold all but 3 of them for $864 making a profit of $7 on each suit sold. How many suits did he buy? 7) A group of boys bought a boat for $450. Five boys failed to pay their shre hence each remaining boys were compelled to pay $4.50 more. How mai were in the original group and how much had each agreed to pay? 17 8) The total expenses of a camping party were $72. If there had been 3 fewer persons in the party, it would have cost each person $2 more than it did. How many people were in the party and how much did it cost each one? 9) A factory tests the road performance of new model cars by driving them at two different rates of speed for at least 100 kilometers at each rate. The speed rates range from 50 to 70 km/hr in the lower range and from 70 to 90 km/hr in the higher range. A driver plans to test a car on an available speedway by driving it for 120 kilometers at a speed in the lower range and then driving 120 kilometers at a rate that is 20 km/hr faster. At what rates should he drive if he plans to complete the test in 3, hours? 10) A train traveled 240 kilometers at a certain speed. When the engine was replaced by an improved model, the speed was increased by 20 km/hr and the travel time for the trip was decreased by 1 hour. What was the rate of each engine? 11) The rate of the current in a stre kilometers and then returned. The round trip required 1 hour and 20 minutes. How fast was he rowing? is 3 km/hr. A man rowed upstream for 3 378