book Maths Puzzle Numerical Ability

solve by using the addition method

x-y=100
0.20x+0.06y=150

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book Other Question

8. Kiran drove from Tortula to Cactus, a distance of 250 miles. She increased her speed by 10 miles per hour for the 360-mile trip from Cactus to Dry Junction. If the total trip to what is 13+32+a,given a=7