PLEASE HELP.. HERE'S THE QUESTION....

Question

RYAN IS GOING TO INVEST $4000 INTO 2 INVESTMENT OPTIONS. ONE OPTION PAYS 3% AND THE OTHER OPTION PAYS 3.5% SIMPLE INTEREST. HOW MUCH DID RYAN INVEST IN EACH OPTION IF THE INTEREST EARNED IN THE OPTION PAYING 3.5% SIMPLE INTEREST IS $94.50 MORE THAN THE INTEREST EARNED IN THE 3% OPTION?

Answer 1

x at 3%
4000-x at 3.5%

.035(4000-x) = .03x + 94.50
x = 700

so, $700 at 3%, $3300 at 3.5%

check: .03*700 = 21.00
.035*3300 = 115.50 = 21.00+94.50

Answer 2

ali's father gave him Rs. 245 for buying stamps. he brought stamps of Rs. 5, Rs. 10 and Rs. 15. the n of the stamps of RS. 5 and Rs. 15 were 2:3 and 1:5 of the no. of Rs. 10 stamps, find the no of each type of stamps he got.