List of top Quantitative Aptitude Questions on Basic Algebra asked in BHU PET

The value of \( 118 - \left[ 121 \div (11 \times 11) - (4) - \{3 - (9 - 2)\} \right] \) is:
Three-fourth of the number of girls in a school is equal to half of the number of boys. If the school has 1420 pupils, how many of them are boys? \[ \frac{3}{4} \times \text{Girls} = \frac{1}{2} \times \text{Boys} \]
A monkey climbs 30 feet at the beginning of each hour and rests for a while when he slips back 20 feet before he again starts climbing in the beginning of the next hour. If he begins his ascent at 8.00 a.m., at what will he first touch a flag at 120 feet from the ground?
Company workers decided to raise Rs. 3 lakhs by equal contribution from each. Had they contributed Rs. 50 each extra, the contribution would have been Rs. 3.25 lakhs. How many workers were they?