Level 3
Some notebooks can be arranged in exactly 15 per row. If the same number of notebooks is arranged in rows of 7 notebooks each, there will be 4 more rows and 4 notebooks left over. How many notebooks are there altogether?
Level 3
A jar contained $2 and $5 notes with a total value of $518. 4 pieces of $5 were exchanged for $2 notes of similar value. In the end, the number of $2 notes was the same as the $5 notes. How many $5 notes were there at first?
Level 3
3 foreigners have the same mass as 5 locals. Each foreigner's mass is 16 kg more than each local. What is the total mass of the 5 locals in kilograms?
Level 3
For every good jacket that Mr Zhang sold, he earned $19. He sold defective jackets at a discount, which would cause him to lose $6 per defective jacket. In July, for every 27 jackets sold, 7 were defective. Mr Zhang earned $3042 from the jackets sold.
How many less jackets sold were defective than good?
How much less money did he earn because of the defective jackets?
Level 3
Henry's freight forwarding company charges $17 for every mirror delivered on time and $10 for every mirror delivered late. In the month of August, Henry freight forwarding company collected $2200. For every 17 mirrors delivered, 15 were delivered on time and 2 were delivered late.
What was the total number of mirrors delivered on time?
How much less money did Henry freight forwarding company collect in August due to the late delivery of the mirrors?
