Review: formulas, rate of work, equations and the number ray
Answers are for parents and teachers.
1
One book costs 7 200 sum. How many sum do 15 books cost?
108000
2
A factory makes 960 parts at 120 per hour. How many hours does the job take?
8
3
Solve 54 000 : y = 9.
6000
4
Solve (x + 58) − 13 = 100.
55
5
The points A(2; 1) and B(2; 8) lie on one vertical line. How many units long is AB?
7