Two times a number is six times the sum of z and y

Jamal watches his older brother Robert lift weights. the bar alone had a mass of 20 kg. on the bar he had two 11.4 kg weights two 4.5 kg weight and four 450 g weights. what mass what's Robert lifting

At a school fair, 70% of the people are under 16 years old. One-third of the people remaining are teachers. If there are 21 teachers at the fair, how many people are there at the fair total?

How would I write an equation for the following problem? Find 4 consecutive even numbers whose sum is 156.

The difference of three times a number and 1 is 8?

Find the product of (3x - 2) and (6x + 1)

A youth chorus has 30 members. There are 14 boys in the chorus. What is the ratio of boys to girls in simplest form? A. 7/15 B. 8/15 C. 7/8 D. 8/7

What does pi stand for?

Express 0.0000000001203 in scientific notation

What are the values of x in this equation? x^4+12x = 4x^2+3x^3

Express 60 as a % of 80