In a science test devi scores 15 marks more than lixin. If devi obtains twice as many marks as lexin. Find the number of marks lixin obtains.

The length of human pregnancies varies normally with a mean of 266 days and a standard deviation of 16 days. What is the median length of all pregnancies?

Marisol pays $12 for 4 notebooks. How many notebooks could she buy with $62?

A high school purchases a printing machine that can put lettering on clothing for $6000. The school plans to print T-shirts with the school logo and sell them. Each T-shirt costs the school $4 and will sell for $12.

Find two numbers the exact answer is between 8*684

17 7/8 divided by 2 3/4

What is this answer 2000 (0.085)

Which of the following is a unit rate?

7 Katalin drove 250 miles on her vacation. She drove an average of 1.3 times faster on the second 125 miles of her trip than she did on the first 125 miles of her trip.

Give me a definition on percentage

Simplify the question 18x - 6x + 2x