Posted by **Magana** on Wednesday, February 15, 2012 at 6:32pm.

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 -
**emma**, Wednesday, March 14, 2012 at 6:18pm
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 -
**Edidiong Umanah**, Friday, September 18, 2015 at 7:28am
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

## Answer This Question

## Related Questions

- Math - A G.p is such that the 3rd term is 9 times the first term, while the ...
- math - The 8th term of ap is 5time the 3rd term, while the 7th term is greater ...
- Arithmetic progession - The third term of an A.P is 10times more than the second...
- Math - The sixth term of an A.P. is 5 times the first term and the eleventh term...
- math - The third term of a geometric progressiom is nine times the first term.if...
- math - The 3rd term of a geometric progression is nine times the first term.if ...
- Maths - The 5th term of an exponential sequence is 4 and of 2nd term is 35(¡)...
- Maths - The sixth term of GP is 16 and the third term is 2.Find the first term ...
- maths - Given that the first term of an A.P is 7 and its 10th term is twice its ...
- math - the 6th term of A.P. is 5 times the fifth term and the 11th term is ...

More Related Questions