Answer:
600
Step-by-step explanation:
x+2x=1800
3x=1800
x=600
Answer:
a. 180
Step-by-step explanation:
= 
cross-multiply:
4x = 720
x = 180
Answer:
90+ 135= 225
Step-by-step explanation:
a can be found with formula (n-2)×180/n, where n is number of sides
a= 135
b=90
Answer:
138
Step-by-step explanation:
There is 60 seconds in a minute, so if the heart beats 23 times in 10 seconds, it is 138 bpm.
23 * 6 = 138
Answer:
Rhion did better in maths test.
Step-by-step explanation:
Given that:
Rhion scored 14 out of 17.
We will find percentage and then compare them.
Percentage = 
Percentage = 
Percentage = 82.35%
Rhion scored 31 out of 39.
Percentage = 
Percentage = 79.48
On comparing,
82.35 > 79.48
Hence,
Rhion did better in maths test.