Answer:
7 hours.
Step-by-step explanation:
An experienced bricklayer can work twice as fast as an apprentice bricklayer. The apprentice needs 14, so 14/2=7
Answer:
b=15
Step-by-step explanation:
2/3b=10
3×2/3b=10×3
2b=30
÷2. ÷2
b=15
Answer:
the first option
Step-by-step explanation:
d=m/v
must get v alone
(m)d = m/v(m)
on the right side, multiply m/v by m.
this cancels out the m's, leaving v alone.
on the left side, multiply d times m.
dm=v
Answer:
The fraction of the students who failed to went partying = 
Step-by-step explanation:
Let total number of students = 100
No. of students partied are twice the no. of students who not partied.
⇒ No. of students partied = 2 × the no. of students who are not partied
No. of students partied before the exam = 20 % of total students
⇒ No. of students partied before the exam =
× 100
⇒ No. of students partied before the exam = 20
No. of students who not partied before the exam = 
Thus the fraction of the students who failed to went partying = 