Answer:
The minimum number of letters John has to send to be sure that Peter receives his letter is 127 letters
Step-by-step explanation:
The four digit numbers that are multiples of 5 and 7 with the last digit = 0 is found as follows
Since the last digit of the house number = 10, then the house number is divisible by 10 which also meets the condition that the house number is divisible by 5
We have the four digit numbers from 1000 to 9999
Hence the numbers divisible by both 7 and 10 are from (1000/70 (Which is 14 + 2/7) - 2/7)×70 + 70 = 1050 to (9999/70 (Which is 142 + 59/70)- 59/70)×70= 9940
Which gives 142 - 15 = 127 numbers which are four digit number multiples of 5 and 7 with the last digit = 0
Hence the minimum number of letters John has to send to be sure that Peter receives his letter = 127 letters.
I’m not sure if this is correct but this is the way i would solve it.
first, make an equation with the given information
2x-3=30
Then, add three to both sides
2x=33
Finally, divide both sides by 2
x= 16.5
x represents the age of maggie so all you have to do is plug the solution into the equation to check your answer.
2(16.5)-3= 30
Number of red marbles/total number of marbles
35/(35+8+7)
35/50
7/10
The probability is 7/10
You'll need to offer wayyyyy more than 15 points :(
