# Maths

posted by .

The 3rd term of an AP is 10 more than the first term while the fifth term is 15 more than the second term.find the sum of the 8th and 15 term of AP.if the 7th term is seven times the first term.

• Maths -

a saturated solution of salt X contain0.28g of the salt in 100cm3 of solution at 25degree centigrate, what is the solubility of the salt X at this temperature (R.m.m of X=56)

• Maths -

Let the 1st term be "a" and the 2nd term be "a+d" then 3rd term = a+2d = 10+a(i.e 10 more than the 1st term) and 5th term = 15+a+d(i.e 15 more than the 2nd term). Then 2d = 10(from 1st statement). This implies that d =5. Then the 7th term = a+6d =7a(7 times the 1st term). 6a = 6d =6(5) =30. Hence, a =30/6 = 5. Also, 8th term = a+7d =5+7(5) = 40 and 15th term = a+14d = 5+14(5) = 75. Finally their sum is 40+75 = 115. Thanks

## Similar Questions

1. ### arithmetic

The 8th term of an A P is 5times the third term while the 7th term is 9 greater than the 4th term.what are the first five term
2. ### math

The 8th term of ap is 5time the 3rd term, while the 7th term is greater than the 4th term, write the first 5 term of the ap
3. ### Math

A G.p is such that the 3rd term is 9 times the first term, while the second term is 124 of the fifth. Find the fourth term
4. ### math

The third term of a geometric progressiom is nine times the first term.if the second term is one-twenty fourth the fifth term.find the fourth term.ar^2=9a. r=sqr of 9 r=3.pls teach me how to get the first term and i can get the 4th …
5. ### math

The 3rd term of a geometric progression is nine times the first term.if the second term is one-twenty fourth the 5th term.find the 4th term. solution ar^2=9a r=sqr of 9 r=3.pls help me on how to get the first term(a)
6. ### Math

The sixth term of an A.P. is 5 times the first term and the eleventh term exceeds twice the fifth term by 3 . Find the 8th term ?
7. ### Arithmetic progession

The third term of an A.P is 10times more than the second term. Find the sum of the eight and fifteen term of the A.P if the seventh term is seven times the first term
8. ### math

The 3rd term of an Arithmetic Progression is 10 more than the first term while the fifth term is 15 more than the second term. Find the sum of the 8th and 15th terms of the Arithmetic Progression if the 7th term is seven times the …
9. ### mathenatic

The sum of sixth term of a.p is 72 and the second term is seven times fifth term find the first term,common difference and the sum of tenth term
10. ### maths

The 8th term of an ap is 5times the 3rd while the 7th term is 9 greater than the 4th term.write the first 5 terms.

More Similar Questions