Rate-of-work problems, unit review; sets
Answers are for parents and teachers.
1
15 l of water is poured into a pool each minute. In how many minutes are 600 l poured?
40
2
The first craftsman makes 8 pots per day and the second makes 11. How many pots do they make together in 6 days?
114
3
Write the set of natural numbers less than 30 that are multiples of 7.
{7, 14, 21, 28}
4
How many elements does the set of letters of the word “maktab” have?
5
5
B = {1, 2, 3} and C = {1, 2, 3, 4}. Are these sets equal? Why?
No, because C has 4 and B does not: B ≠ C.