We can label x as the number of 7th and 8th graders, and x-50 as the number of 6th graders. So, we have x+x+x-50=3x-50=790 students. Therefore, 3x=840 students and x=280 students. We can solve for x-50, which is 280-50=230. Back again, we have 9/10(x-50)+7/8x+3/5x, which is just 9/10(230)+7/8(280)+3/5(280)=207+245+168=620 students.
If we add 2y to both sides, we get 3x+2y=10-7, 3x+2y=3. Since we are finding for 6x+4y, double both sides of the equation, so 6.
Our keywords: product, increased, quotient
Now, translating this, we have 5∗6+306 .
Yes, it is! The median is constant!
1. Wild guess, is the answer 29?
The negatives cancel out, so we are left with 0.6p=14.4. Convert 0.6p to 6/10p and 14.4 to 14 4/10, if you like. Your answer should be 24.
Original amount: 80 books
1st month: 100 books
2nd month: 125 books
3rd month: 156.25 books
4th month: 195.3125 books
5th month: 244.14 books
6th month: 305.175 books
7th month: 381.46 books
8th month: 476.825 books
9th month: 596.03 books
10th month: 745.03 books
Thus, by the end of the 10th month, 745 books are expected to be donated to the library.
Can you post it again? Looks like the image is blocked by a moderator!
Hey, SG here is a short way!
We know that the square root of 25 is 5, so every 5th power should end in the last digit.
Thus, 12^5 ends in a 0, and 8^5 also end in a zero. Now, we have two zeroes and doing some quick computation, we have 0+0=0.
43∗54∗62=26∗54∗22∗32=28∗32∗54. There is actually a neat way to calculate the number of factors a number has. Suppose we have 4k , and the number of factors that number would have is 4k+1 . Following the same example here, we have 9∗3∗5=27∗5=135 factors.
