Redlands school sent x students to a revision day. st samuel's school sent twice as many students as redlands school. francis long school sent 7 fewer students than redlands school. each student paid £15 for the revision day the students paid a total of £1155 work out how many students were sent by each school to the revision day show all working out.

Let x be the number of students that Redlands School sent to a revision day.

If St Samuel's School sent twice as many students as Redlands School, then St Samuel's School sent 2x students.

If Francis Long School sent 7 fewer students than Redlands School, then Francis Long School sent x-7 students.

The total number of students is

x+2x+x-7=4x-7.

Each student paid £15 for the revision day, then all together they paid  £15·(4x-7) that is £1155. Solve this equation:

15·(4x-7)=1155,

60x-105=1155,

60x=1155+105,

60x=1260,

x=1260:60,

x=21.

Then,

13

step-by-step explanation:

169-1=168

168-3=165

165-5=160

160-7=153

153-9=144

144-11=133

133-13=120

120-15=105

105-17=88

88-19=69

69-21=48

48-23=25

25-25=0

since it took 13times to completely subtract it hence its square root is 13

the answer is a

step-by-step explanation: