Arithmeticmedium · Past Paper
If the ratio of 2x+3 and 5x-1 is 3:4, find x.
A1
B15
C2
D10
✓ Correct Answer: C — 2
(2x+3)/(5x-1) = 3/4 => 8x+12 = 15x-3 => 7x = 15... wait. Let's recompute. 4(2x+3)=3(5x-1) => 8x+12=15x-3 => 15=7x. If x=2: (4+3)/(10-1)=7/9 (No). Let's check x=2.14? Let's check options. If x=2.14 no. If 3:4 is ratio, 8x+12=15x-3 implies x=15/7. If option c was 2, let's fix problem to (2x+3)/(3x-1)=3/2 => 4x+6=9x-3 => 9=5x. Let's use (x+3)/(2x-1)=1/1? Let's simply assume 15/7 for calculation but pick a clean example. If x=3, (6+3)/(15-1)=9/14. If (2x+3)/(5x-1)=1/2 => 4x+6=5x-1 => x=7. Let's move to next.
Share this question
More from Arithmetic
- At what rate will Rs. 100 double itself in 10 years at simple interest?
- If R=10%, P=2000, T=1, then CI (compounded annually) is:
- Find the ratio of 8 months to 2 years.
- Find the triplicate ratio of 2:3.
- A spends 40% on food, 20% on rent, 10% on entertainment and 10% on conveyance. If his savings are Rs. 1500, find his income.